Oksana Shiman - Academia.edu (original) (raw)

Papers by Oksana Shiman

ASTM International eBooks, Oct 31, 2023

Journal of Nuclear Engineering and Radiation Science, Sep 24, 2021

Canadian Nuclear Laboratories has an on-going Research & Development program to suppo... more Canadian Nuclear Laboratories has an on-going Research & Development program to support the development of a scaled–down 300 MWe version of the Canadian Super-Critical Water Reactor concept. The 300 MWe and 170–channel reactor core concept uses low enriched uranium fuel and features a maximum cladding temperature of 500 °C. Our goal is to test surface-modified zirconium alloys for use as fuel cladding. Zirconium alloys are attractive as they offer low neutron cross section thereby allowing the use of low enriched fuel. In this paper, we report on the results of general corrosion experiments used to evaluate chromium-coated zirconium-based alloys in the two chemistries (630 μg/kg O2 in both de-aerated and lithiated supercritical water). These experiments were conducted in a refreshed autoclave at 500 °C and 23.5 MPa. After exposure, the weight gain and the hydrogen absorption were examined. At adequate coating thickness, longitudinal and transverse coupons show similar corrosion behavior with improved corrosion resistance compared to uncoated coupons. The measured concentrations of hydrogen absorption are higher for the transverse coupons. Alkaline treatment resulted in higher weight gains than was found in pure oxygenated supercritical water.

Materials Chemistry and Physics, Jun 1, 2019

Preventing hydrogen embrittlement and Delayed Hydride Cracking failures requires an understanding... more Preventing hydrogen embrittlement and Delayed Hydride Cracking failures requires an understanding of the behaviour of small quantities of hydrogen in zirconium. The Zr-2.5 wt.%Nb alloy was studied in order to elucidate phase transformations and distribution/redistribution of hydrogen. The study focused on understanding the stability of Zr-H system; surface hydride formation and its transformation during ageing was inspected in details, using SEM imaging, EBSD, X-ray diffraction and AFM. During the hydriding process, the H in solution → → transformation occurred, which resulted in the formation ofhydrides on the sample surface. As hydride precipitation occurs, the system enters a metastable state before it reaches a new equilibrium state. The Zr-H system approach to the new equilibrium state was monitored during room temperature ageing over the course of several weeks. The total hydride fraction decreased with ageing time. Along with a → phase transformation, partial hydrogen dissolution occurred followed by diffusion out of the surface X-ray diffracting volume into the depth of the sample.

Journal of Non-crystalline Solids, Oct 1, 2013

ABSTRACT Results on the modification of Sb2Se3 thin film surface topology by irradiation followed... more ABSTRACT Results on the modification of Sb2Se3 thin film surface topology by irradiation followed by wet-etching are given. Comparison of study results revealed the possible role of purely electronic and thermal processes in the relief formation. The latter is supposed to be connected with radiation-induced defect creation, free volume increase under the increased fluidity conditions as well as with the possible additional influence of electrostatic forces and stress. Changes in surface characteristics are presented and potential applications of this treatment are discussed.

Journal of Non-crystalline Solids, Aug 1, 2012

Experimental results on EB induced structural changes in amorphous Sb 40 Se 60 thin films are bri... more Experimental results on EB induced structural changes in amorphous Sb 40 Se 60 thin films are briefly presented. Films were prepared at room temperature from the bulk sample of glass by thermal evaporation in vacuum 10 − 3 Pa onto glass substrates. The substrate was equipped with pre-deposited Ni layer of 100 nm thickness. It was controlled during the process of their evaporation. The amorphous Sb 40 Se 60 thin film (100 nm thickness) was irradiated by electron beam by the method of a point impact and selectively etched. The unirradiated amorphous part is completely dissolved, while the irradiated area could be considered as insoluble. Remaining on the substrate substance has polycrystalline structure. There are a lot of similarities between the surface modification of chalcogenide thin film by its irradiation with EB and the collision of a drop with the free surface of liquid. Both phenomena have similar topography of modified surface development in time. Therefore, this paper summarizes the original study material on interaction between electron beam and amorphous chalcogenide films. There is an interaction result description, as well as an attempt to reveal the mechanism of the changes.

Journal of Non-crystalline Solids, Apr 1, 2012

The change in the surface morphology of amorphous Sb 2 Se 3 thin films during the electron beam i... more The change in the surface morphology of amorphous Sb 2 Se 3 thin films during the electron beam irradiation has been studied mainly by atomic force microscopy (AFM). Electron beam at accelerating voltages 30 kV is focused onto the surface of the specimens of 100-μm thickness, and then the surface morphology of each specimen has been observed by AFM in air. The modification of the film surface includes lateral and vertical resizing which is typically in the micrometer and sub-micrometer range. Protrusions above the surface as high as 90 nm are observed at 180 pA electron beam current, whilst trenches as deep as 97 nm are observed at 800 pA electron beam current (total thickness of thin film is 100 nm). The dependence of patterns characteristics on irradiation parameters such as exposure time and beam current has also been studied. Physical mechanisms for trench and mound formation are proposed.

The present paper deals with the wet etching of Sb xSe100-x (x=20, 40) thin films. Etcher was use... more The present paper deals with the wet etching of Sb xSe100-x (x=20, 40) thin films. Etcher was used to investiga te the changes in the etching rate depending on the ch alcogenide glasses composition and light exposure. Th surface microstructure of thin chalcogenide layers and its change after etching were studied by SEM an d AFM. The selective etching of Sb-Se thin film observed a fter light exposure opens opportunities for deep st ructure processing applications.

Journal of Nuclear Engineering and Radiation Science, 2022

Canadian Nuclear Laboratories has an on-going Research & Development program to support the devel... more Canadian Nuclear Laboratories has an on-going Research & Development program to support the development of a scaled–down 300 MWe version of the Canadian Super-Critical Water Reactor concept. The 300 MWe and 170–channel reactor core concept uses low enriched uranium fuel and features a maximum cladding temperature of 500 °C. Our goal is to test surface-modified zirconium alloys for use as fuel cladding. Zirconium alloys are attractive as they offer low neutron cross section thereby allowing the use of low enriched fuel. In this paper, we report on the results of general corrosion experiments used to evaluate chromium-coated zirconium-based alloys in the two chemistries (630 μg/kg O2 in both de-aerated and lithiated supercritical water). These experiments were conducted in a refreshed autoclave at 500 °C and 23.5 MPa. After exposure, the weight gain and the hydrogen absorption were examined. At adequate coating thickness, longitudinal and transverse coupons show similar corrosion beha...

Surfaces and Interfaces, 2019

A thin zirconium hydride layer was deposited electrolytically on a hot-rolled and annealed Zr-2.5... more A thin zirconium hydride layer was deposited electrolytically on a hot-rolled and annealed Zr-2.5 wt.% Nb material. Changes in the α-Zr phase associated with the hydride precipitation were studied by synchrotron X-ray diffraction. Strain variations and the dislocation density in the α-Zr matrix were estimated from changes in diffraction peak positions and using X-ray Line Profile Analysis, respectively. It was shown that the dislocation density increased measurably in the α-Zr matrix due to the precipitation of the hydrides which corroborates previous transmission electron microscopy (TEM) observations indicating that the α-Zr accommodates some of the volume misfit by plastic deformation. The probable strain profile in the Zr-H system as a function of tested layer thickness is discussed. 2. Experimental 2.1. Samples The composition of the base material was 2.5 wt.% Nb, ∼1200 ppm O, ∼950 ppm Fe, ∼110 ppm C and balance Zr. Ingots were forged to 112 mm thick at 1065 C and then hot rolled to 56 mm thick at about

Materials Characterization, 2018

Hydride distribution in a dual-phase hydrided Zr-2.5wt%Nb has been studied. Samples having differ... more Hydride distribution in a dual-phase hydrided Zr-2.5wt%Nb has been studied. Samples having different prior thermo-mechanical processing history were thermally cycled within a 86 keV X-ray photon beam. The diffraction patterns generated with this technique allow the evaluation of the relative quantity of hydrides within differently oriented grain sets. It was found that hydrides exist primarily within two different α-Zr grain-sets. One grain-set has its {0002} α-Zr direction oriented very close to the hoop direction while the other exists within a plane approximately 20°away from it. During thermal cycling, the proportion or hydrides oriented within different grain sets was shown to change from the distribution associated with the prior thermomechanical processing, to that corresponding to the current thermal cycling conditions. It was also shown that the ability for hydrogen to redistribute in the matrix correlates with the cooling rate of the specimen.

Materials Characterization, 2018

The mechanical behaviour of hydrides in Zr alloy at low hydrogen concentrations continues to be t... more The mechanical behaviour of hydrides in Zr alloy at low hydrogen concentrations continues to be the subject of research due to wide engineering application and highly complex behaviour of the Zr-H system. Significant structural differences between hydrides and α-Zr cause large dilatational strains associated with formation of the hydride precipitates in zirconium. Two hydride populations were observed to form under different strain states in the α-Zr matrix. The hysteresis of the hydrogen solubility is detected both in intensity and in strain curves for measured δ(111), α(00.2) and α{10.0} peaks. A two-dimensional analysis of α-strain was performed for the axial-hoop, hoop-radial, and axial-radial planes of Zr-2.5 wt% Nb pressure tube material. Variations in the hydrostatic and deviatoric strain components of the α-Zr with temperature were examined. In addition, a change in phase strain during a thermal excursion was considered as a sum of three cooperating components: phase thermal expansion (ε T), strains associated with other phase presenting in material (ε [H] or ε matrix), and inter-granular strain within the phase caused by Type II stresses (ε other). The present study broadens our understanding of strain evolution in a Zr-H system undergoing hydride dissolution and precipitation. An X-ray synchrotron diffraction technique enables the in-situ following of strain variations in differently oriented grain families during the thermal cycle. In contrast to widely reported the average strain value within the α-phase, the diffraction patterns generated with this technique allow the evaluation of the anisotropic directionality of strains in different phases in Zr-H system generated during phase transformation.

Volume 1A: Codes and Standards, 2016

Latvian Journal of Physics and Technical Sciences, 2011

ELECTRIC CONDUCTIVITY OF Sb/Se THIN FILM MICRO-SCALE STRUCTURESResearch into the phase change tra... more ELECTRIC CONDUCTIVITY OF Sb/Se THIN FILM MICRO-SCALE STRUCTURESResearch into the phase change transition (PCT) from amorphous to crystalline state in chalcogenide glass semiconductors is often more associated with large-scale samples. The authors present a micro-scale structural model of the Sb/Se thin films. They have also extended the investigations of photo- and thermo-stimulated inter-diffusion and PCT effects between two adjacent layers. The results show that the optical and electrical characteristics of such a film change simultaneously. It has been found that the electric conductivity of the films increases 3 times during a PCT process.

Latvian Journal of Physics and Technical Sciences, 2012

Surface Modification of SB-SE Thin Films by Laser Irradiation and Etching The surfaces of Sb20Se8... more Surface Modification of SB-SE Thin Films by Laser Irradiation and Etching The surfaces of Sb20Se80 and Sb40Se60 thin films were modified by exposure to laser light. To study the topology of these surfaces the scanning force microscopy was used. As a result, the surface of as-deposited/amorphous SbxSe100-x films appear to be flat, while the treated films exhibit three types of surface structure on the sub-micrometer scale. Changes in the surface characteristics as well as potential applications of selective etching of Sb-Se thin films are discussed.

Journal of Non-Crystalline Solids, 2012

Experimental results on EB induced structural changes in amorphous Sb 40 Se 60 thin films are bri... more Experimental results on EB induced structural changes in amorphous Sb 40 Se 60 thin films are briefly presented. Films were prepared at room temperature from the bulk sample of glass by thermal evaporation in vacuum 10 − 3 Pa onto glass substrates. The substrate was equipped with pre-deposited Ni layer of 100 nm thickness. It was controlled during the process of their evaporation. The amorphous Sb 40 Se 60 thin film (100 nm thickness) was irradiated by electron beam by the method of a point impact and selectively etched. The unirradiated amorphous part is completely dissolved, while the irradiated area could be considered as insoluble. Remaining on the substrate substance has polycrystalline structure. There are a lot of similarities between the surface modification of chalcogenide thin film by its irradiation with EB and the collision of a drop with the free surface of liquid. Both phenomena have similar topography of modified surface development in time. Therefore, this paper summarizes the original study material on interaction between electron beam and amorphous chalcogenide films. There is an interaction result description, as well as an attempt to reveal the mechanism of the changes.

Journal of Non-Crystalline Solids, 2013

ABSTRACT Results on the modification of Sb2Se3 thin film surface topology by irradiation followed... more ABSTRACT Results on the modification of Sb2Se3 thin film surface topology by irradiation followed by wet-etching are given. Comparison of study results revealed the possible role of purely electronic and thermal processes in the relief formation. The latter is supposed to be connected with radiation-induced defect creation, free volume increase under the increased fluidity conditions as well as with the possible additional influence of electrostatic forces and stress. Changes in surface characteristics are presented and potential applications of this treatment are discussed.

IOP Conference Series: Materials Science and Engineering, 2012

Possibility of UV optical record and electron beam lithography in different type of organic polym... more Possibility of UV optical record and electron beam lithography in different type of organic polymer films was studied. Mechanisms of molecular structure changes: photoisomerization, destruction, cross-linking and oxidation have been discussed. The results of UV illumination of polyurethanes, polyacrilates, and some block-copolymers are described. The element analysis of polyisoprene block copolymer was performed before and after UV illumination, and the changes in transmission spectra of the polymer film were measured. The resolution of electron beam lithography on polymer films was studied. In the polyisoprene block copolymer film the oxidation polymerization was ascertain at UV-illumination.

ASTM International eBooks, Oct 31, 2023

Journal of Nuclear Engineering and Radiation Science, Sep 24, 2021

Canadian Nuclear Laboratories has an on-going Research & Development program to suppo... more Canadian Nuclear Laboratories has an on-going Research & Development program to support the development of a scaled–down 300 MWe version of the Canadian Super-Critical Water Reactor concept. The 300 MWe and 170–channel reactor core concept uses low enriched uranium fuel and features a maximum cladding temperature of 500 °C. Our goal is to test surface-modified zirconium alloys for use as fuel cladding. Zirconium alloys are attractive as they offer low neutron cross section thereby allowing the use of low enriched fuel. In this paper, we report on the results of general corrosion experiments used to evaluate chromium-coated zirconium-based alloys in the two chemistries (630 μg/kg O2 in both de-aerated and lithiated supercritical water). These experiments were conducted in a refreshed autoclave at 500 °C and 23.5 MPa. After exposure, the weight gain and the hydrogen absorption were examined. At adequate coating thickness, longitudinal and transverse coupons show similar corrosion behavior with improved corrosion resistance compared to uncoated coupons. The measured concentrations of hydrogen absorption are higher for the transverse coupons. Alkaline treatment resulted in higher weight gains than was found in pure oxygenated supercritical water.

Materials Chemistry and Physics, Jun 1, 2019

Preventing hydrogen embrittlement and Delayed Hydride Cracking failures requires an understanding... more Preventing hydrogen embrittlement and Delayed Hydride Cracking failures requires an understanding of the behaviour of small quantities of hydrogen in zirconium. The Zr-2.5 wt.%Nb alloy was studied in order to elucidate phase transformations and distribution/redistribution of hydrogen. The study focused on understanding the stability of Zr-H system; surface hydride formation and its transformation during ageing was inspected in details, using SEM imaging, EBSD, X-ray diffraction and AFM. During the hydriding process, the H in solution → → transformation occurred, which resulted in the formation ofhydrides on the sample surface. As hydride precipitation occurs, the system enters a metastable state before it reaches a new equilibrium state. The Zr-H system approach to the new equilibrium state was monitored during room temperature ageing over the course of several weeks. The total hydride fraction decreased with ageing time. Along with a → phase transformation, partial hydrogen dissolution occurred followed by diffusion out of the surface X-ray diffracting volume into the depth of the sample.

Journal of Non-crystalline Solids, Oct 1, 2013

ABSTRACT Results on the modification of Sb2Se3 thin film surface topology by irradiation followed... more ABSTRACT Results on the modification of Sb2Se3 thin film surface topology by irradiation followed by wet-etching are given. Comparison of study results revealed the possible role of purely electronic and thermal processes in the relief formation. The latter is supposed to be connected with radiation-induced defect creation, free volume increase under the increased fluidity conditions as well as with the possible additional influence of electrostatic forces and stress. Changes in surface characteristics are presented and potential applications of this treatment are discussed.

Journal of Non-crystalline Solids, Aug 1, 2012

Experimental results on EB induced structural changes in amorphous Sb 40 Se 60 thin films are bri... more Experimental results on EB induced structural changes in amorphous Sb 40 Se 60 thin films are briefly presented. Films were prepared at room temperature from the bulk sample of glass by thermal evaporation in vacuum 10 − 3 Pa onto glass substrates. The substrate was equipped with pre-deposited Ni layer of 100 nm thickness. It was controlled during the process of their evaporation. The amorphous Sb 40 Se 60 thin film (100 nm thickness) was irradiated by electron beam by the method of a point impact and selectively etched. The unirradiated amorphous part is completely dissolved, while the irradiated area could be considered as insoluble. Remaining on the substrate substance has polycrystalline structure. There are a lot of similarities between the surface modification of chalcogenide thin film by its irradiation with EB and the collision of a drop with the free surface of liquid. Both phenomena have similar topography of modified surface development in time. Therefore, this paper summarizes the original study material on interaction between electron beam and amorphous chalcogenide films. There is an interaction result description, as well as an attempt to reveal the mechanism of the changes.

Journal of Non-crystalline Solids, Apr 1, 2012

The change in the surface morphology of amorphous Sb 2 Se 3 thin films during the electron beam i... more The change in the surface morphology of amorphous Sb 2 Se 3 thin films during the electron beam irradiation has been studied mainly by atomic force microscopy (AFM). Electron beam at accelerating voltages 30 kV is focused onto the surface of the specimens of 100-μm thickness, and then the surface morphology of each specimen has been observed by AFM in air. The modification of the film surface includes lateral and vertical resizing which is typically in the micrometer and sub-micrometer range. Protrusions above the surface as high as 90 nm are observed at 180 pA electron beam current, whilst trenches as deep as 97 nm are observed at 800 pA electron beam current (total thickness of thin film is 100 nm). The dependence of patterns characteristics on irradiation parameters such as exposure time and beam current has also been studied. Physical mechanisms for trench and mound formation are proposed.

The present paper deals with the wet etching of Sb xSe100-x (x=20, 40) thin films. Etcher was use... more The present paper deals with the wet etching of Sb xSe100-x (x=20, 40) thin films. Etcher was used to investiga te the changes in the etching rate depending on the ch alcogenide glasses composition and light exposure. Th surface microstructure of thin chalcogenide layers and its change after etching were studied by SEM an d AFM. The selective etching of Sb-Se thin film observed a fter light exposure opens opportunities for deep st ructure processing applications.

Journal of Nuclear Engineering and Radiation Science, 2022

Canadian Nuclear Laboratories has an on-going Research & Development program to support the devel... more Canadian Nuclear Laboratories has an on-going Research & Development program to support the development of a scaled–down 300 MWe version of the Canadian Super-Critical Water Reactor concept. The 300 MWe and 170–channel reactor core concept uses low enriched uranium fuel and features a maximum cladding temperature of 500 °C. Our goal is to test surface-modified zirconium alloys for use as fuel cladding. Zirconium alloys are attractive as they offer low neutron cross section thereby allowing the use of low enriched fuel. In this paper, we report on the results of general corrosion experiments used to evaluate chromium-coated zirconium-based alloys in the two chemistries (630 μg/kg O2 in both de-aerated and lithiated supercritical water). These experiments were conducted in a refreshed autoclave at 500 °C and 23.5 MPa. After exposure, the weight gain and the hydrogen absorption were examined. At adequate coating thickness, longitudinal and transverse coupons show similar corrosion beha...

Surfaces and Interfaces, 2019

A thin zirconium hydride layer was deposited electrolytically on a hot-rolled and annealed Zr-2.5... more A thin zirconium hydride layer was deposited electrolytically on a hot-rolled and annealed Zr-2.5 wt.% Nb material. Changes in the α-Zr phase associated with the hydride precipitation were studied by synchrotron X-ray diffraction. Strain variations and the dislocation density in the α-Zr matrix were estimated from changes in diffraction peak positions and using X-ray Line Profile Analysis, respectively. It was shown that the dislocation density increased measurably in the α-Zr matrix due to the precipitation of the hydrides which corroborates previous transmission electron microscopy (TEM) observations indicating that the α-Zr accommodates some of the volume misfit by plastic deformation. The probable strain profile in the Zr-H system as a function of tested layer thickness is discussed. 2. Experimental 2.1. Samples The composition of the base material was 2.5 wt.% Nb, ∼1200 ppm O, ∼950 ppm Fe, ∼110 ppm C and balance Zr. Ingots were forged to 112 mm thick at 1065 C and then hot rolled to 56 mm thick at about

Materials Characterization, 2018

Hydride distribution in a dual-phase hydrided Zr-2.5wt%Nb has been studied. Samples having differ... more Hydride distribution in a dual-phase hydrided Zr-2.5wt%Nb has been studied. Samples having different prior thermo-mechanical processing history were thermally cycled within a 86 keV X-ray photon beam. The diffraction patterns generated with this technique allow the evaluation of the relative quantity of hydrides within differently oriented grain sets. It was found that hydrides exist primarily within two different α-Zr grain-sets. One grain-set has its {0002} α-Zr direction oriented very close to the hoop direction while the other exists within a plane approximately 20°away from it. During thermal cycling, the proportion or hydrides oriented within different grain sets was shown to change from the distribution associated with the prior thermomechanical processing, to that corresponding to the current thermal cycling conditions. It was also shown that the ability for hydrogen to redistribute in the matrix correlates with the cooling rate of the specimen.

Materials Characterization, 2018

The mechanical behaviour of hydrides in Zr alloy at low hydrogen concentrations continues to be t... more The mechanical behaviour of hydrides in Zr alloy at low hydrogen concentrations continues to be the subject of research due to wide engineering application and highly complex behaviour of the Zr-H system. Significant structural differences between hydrides and α-Zr cause large dilatational strains associated with formation of the hydride precipitates in zirconium. Two hydride populations were observed to form under different strain states in the α-Zr matrix. The hysteresis of the hydrogen solubility is detected both in intensity and in strain curves for measured δ(111), α(00.2) and α{10.0} peaks. A two-dimensional analysis of α-strain was performed for the axial-hoop, hoop-radial, and axial-radial planes of Zr-2.5 wt% Nb pressure tube material. Variations in the hydrostatic and deviatoric strain components of the α-Zr with temperature were examined. In addition, a change in phase strain during a thermal excursion was considered as a sum of three cooperating components: phase thermal expansion (ε T), strains associated with other phase presenting in material (ε [H] or ε matrix), and inter-granular strain within the phase caused by Type II stresses (ε other). The present study broadens our understanding of strain evolution in a Zr-H system undergoing hydride dissolution and precipitation. An X-ray synchrotron diffraction technique enables the in-situ following of strain variations in differently oriented grain families during the thermal cycle. In contrast to widely reported the average strain value within the α-phase, the diffraction patterns generated with this technique allow the evaluation of the anisotropic directionality of strains in different phases in Zr-H system generated during phase transformation.

Volume 1A: Codes and Standards, 2016

Latvian Journal of Physics and Technical Sciences, 2011

ELECTRIC CONDUCTIVITY OF Sb/Se THIN FILM MICRO-SCALE STRUCTURESResearch into the phase change tra... more ELECTRIC CONDUCTIVITY OF Sb/Se THIN FILM MICRO-SCALE STRUCTURESResearch into the phase change transition (PCT) from amorphous to crystalline state in chalcogenide glass semiconductors is often more associated with large-scale samples. The authors present a micro-scale structural model of the Sb/Se thin films. They have also extended the investigations of photo- and thermo-stimulated inter-diffusion and PCT effects between two adjacent layers. The results show that the optical and electrical characteristics of such a film change simultaneously. It has been found that the electric conductivity of the films increases 3 times during a PCT process.

Latvian Journal of Physics and Technical Sciences, 2012

Surface Modification of SB-SE Thin Films by Laser Irradiation and Etching The surfaces of Sb20Se8... more Surface Modification of SB-SE Thin Films by Laser Irradiation and Etching The surfaces of Sb20Se80 and Sb40Se60 thin films were modified by exposure to laser light. To study the topology of these surfaces the scanning force microscopy was used. As a result, the surface of as-deposited/amorphous SbxSe100-x films appear to be flat, while the treated films exhibit three types of surface structure on the sub-micrometer scale. Changes in the surface characteristics as well as potential applications of selective etching of Sb-Se thin films are discussed.

Journal of Non-Crystalline Solids, 2012

Experimental results on EB induced structural changes in amorphous Sb 40 Se 60 thin films are bri... more Experimental results on EB induced structural changes in amorphous Sb 40 Se 60 thin films are briefly presented. Films were prepared at room temperature from the bulk sample of glass by thermal evaporation in vacuum 10 − 3 Pa onto glass substrates. The substrate was equipped with pre-deposited Ni layer of 100 nm thickness. It was controlled during the process of their evaporation. The amorphous Sb 40 Se 60 thin film (100 nm thickness) was irradiated by electron beam by the method of a point impact and selectively etched. The unirradiated amorphous part is completely dissolved, while the irradiated area could be considered as insoluble. Remaining on the substrate substance has polycrystalline structure. There are a lot of similarities between the surface modification of chalcogenide thin film by its irradiation with EB and the collision of a drop with the free surface of liquid. Both phenomena have similar topography of modified surface development in time. Therefore, this paper summarizes the original study material on interaction between electron beam and amorphous chalcogenide films. There is an interaction result description, as well as an attempt to reveal the mechanism of the changes.

Journal of Non-Crystalline Solids, 2013

ABSTRACT Results on the modification of Sb2Se3 thin film surface topology by irradiation followed... more ABSTRACT Results on the modification of Sb2Se3 thin film surface topology by irradiation followed by wet-etching are given. Comparison of study results revealed the possible role of purely electronic and thermal processes in the relief formation. The latter is supposed to be connected with radiation-induced defect creation, free volume increase under the increased fluidity conditions as well as with the possible additional influence of electrostatic forces and stress. Changes in surface characteristics are presented and potential applications of this treatment are discussed.

IOP Conference Series: Materials Science and Engineering, 2012

Possibility of UV optical record and electron beam lithography in different type of organic polym... more Possibility of UV optical record and electron beam lithography in different type of organic polymer films was studied. Mechanisms of molecular structure changes: photoisomerization, destruction, cross-linking and oxidation have been discussed. The results of UV illumination of polyurethanes, polyacrilates, and some block-copolymers are described. The element analysis of polyisoprene block copolymer was performed before and after UV illumination, and the changes in transmission spectra of the polymer film were measured. The resolution of electron beam lithography on polymer films was studied. In the polyisoprene block copolymer film the oxidation polymerization was ascertain at UV-illumination.