Zbigniew Tylczynski | Adam Mickiewicz University, Poznan, Poland (original) (raw)
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Papers by Zbigniew Tylczynski
Materials Letters, 2011
We studied an influence of uniaxial pressure on the triglycine selenate single crystals during si... more We studied an influence of uniaxial pressure on the triglycine selenate single crystals during simultaneous illumination by the continuous wave 532 laser at power about 300mW. Simultaneously we have studied two-photon absorption for the nanosecond 1064nm Nd:YAG laser fundamental wavelength. The studies were performed during several cycles of applied uniaxial pressure. A correlation between the photoinduced absorption and the two-photon
Ferroelectrics Letters Section, 2015
Journal of Materials Science: Materials in Electronics, 2012
ABSTRACT Photo-induced treatment of L-alanine single crystals grown by slow evaporation method at... more ABSTRACT Photo-induced treatment of L-alanine single crystals grown by slow evaporation method at an ambient temperature was performed using a 25 ps Nd:YAG pulsed laser in the presence of an external acoustic filed. The changes of the absorption were studied for the wavelength 265 nm near the energy band gap edge at acoustical power density varying within 4–6 W/cm 2 . The observed absorp-tion changes indicate that the external optical electric field strengths and acoustical power densities may be efficient parameters for the characterization of photo-optical and acousto-optical treatment of the samples. From the X-ray diffraction data we have optimized the atomic positions assuming that force on the atoms is around 1 mRy/au. These are used to calculate the electronic structure and the chemical bonding for the amino acid L-alanine single crystals. The calculated electronic band structure and densities of states confirms the experimental results that this compound possesses a relatively large energy band gap. The upper valence band has its maximum at the Z point of the Brillouin zone while the conduction band minimum is located at C point in the zone center, resulting in an indirect energy band gap. The electronic energy gap is equal to 4.19 eV within a framework of the used local density approximation and 4.54 eV with the Engel–Vosko generalized gradient approximation as the exchange correlation potential. This is in an agreement with our experimentally measured energy band gap *4.67 eV. The existence of O-p character in the upper valence band has a significant consequence for the optical band gap. From our calculated electron charge density distribution, we obtain a space electron charge density distribution in the average unit cell of the crystal. The chemical bonding features of L-alanine amino acid were analyzed.
We argue that "L-valine ferric chloride" crystal reported by Geetha et al [Curr. Appl. ... more We argue that "L-valine ferric chloride" crystal reported by Geetha et al [Curr. Appl. Phys. 15 (2015) 201-207] is not a new nonlinear optical material but instead a dubious crystal.
![Research paper thumbnail of Comment on "[N(CH3)3H]2ZnCl4: Ferroelectric properties and characterization of phase transitions by Raman spectroscopy](https://attachments.academia-assets.com/84634794/thumbnails/1.jpg)
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Physical Review B, 2011
... Anna Gagor and Adam Pietraszko W. Trzebiatowski Institute of Low Temperature and Structure Re... more ... Anna Gagor and Adam Pietraszko W. Trzebiatowski Institute of Low Temperature and Structure Research PAS, PO Box 1410, PL-50-950 Wroclaw, Poland ... 2011 American Physical Society Page 2. MACIEJ WOJTA S et al. PHYSICAL REVIEW B 83, 144103 (2011) ...
Ferroelectrics Letters Section, 2000
ABSTRACT Changes in the velocity and attenuation coefficient of quasi-longitudinal waves propagat... more ABSTRACT Changes in the velocity and attenuation coefficient of quasi-longitudinal waves propagating in TGSe crystal in the direction X induced by uniaxial stress σY were measured in the temperature range of ferroelectric phase transition. The application of uniaxial stress was found to shift the phase transition temperature by ∂TC/∂σY = −0.18 K/MPa. For the stress greater than 2 MPa an additional anomaly in the wave velocity and attenuation appears, which has been interpreted as a splitting of the phase transition.
Crystal Research and Technology, 2005
Physical Review Letters, 2001
Frontiers of Physics, 2019
This collection presents 505 papers on ferroelectricity in single crystals, ceramics and polymers... more This collection presents 505 papers on ferroelectricity in single crystals, ceramics and polymers in which pointed or elliptical hysteresis loops would testify to their ferroelectric properties. In some papers, the authors ensure that ferroelectricity can occur even in materials that do not have a polar axis of symmetry.
We argue that "L-valine ferric chloride" crystal reported by Geetha et al [Curr. Appl. ... more We argue that "L-valine ferric chloride" crystal reported by Geetha et al [Curr. Appl. Phys. 15 (2015) 201-207] is not a new nonlinear optical material but instead a dubious crystal.
Journal of Thermal Analysis and Calorimetry, 2015
We argue that the 'tris thiourea chromium(III) sulphate' crystal (Madhurambal et al. in
Journal- Korean Physical Society
High resolution Brillouin spectroscopy has been used to study the elastic properties of K2ZnCl4 c... more High resolution Brillouin spectroscopy has been used to study the elastic properties of K2ZnCl4 crystal in the temperature range from 100 to 300 K in order to establish the temperature behaviour of elastic sti�ness tensor components. Ten Brillouin modes have been observed for the phonons propagating in the six directions. All phonon velocities reveal di�erent anomalies at the phase transition (T0 = 144.7 K). The obtained results allowed a calculation of the temperature dependence of elastic constants of the prototype phase. A comparison of the presented results with the earlier low-frequency data indicates a strong relaxational character of the order parameter in K2ZnCl4 and the anomalous dispersion behaviour of quasilongitudinal and quasitransverse phonons propagating along the [110] direction.
Physica Status Solidi (a), 1996
ABSTRACT Elastic and piezoelectric properties of MAPCB crystals have been studied in the temperat... more ABSTRACT Elastic and piezoelectric properties of MAPCB crystals have been studied in the temperature range 110 to 310 K. A correlation between changes in the elastic properties and anomalies in the spontaneous polarization of the crystals at 170 K is found. No anomaly in the piezoelectric properties in the vicinity of the newly postulated phase transition at 250 K has been detected.Die elastischen und piezoelektrischen Eigenschaften von MAPCB-Kristallen im Temperaturbereich 110 bis 310 K wurden gemessen. Es wurde eine Korrelation zwischen den Änderungen der elastischen Eigenschaften und der Anomalie der spontanen Polarisation bei 170 K gefunden. Keine Anomalie der piezoelektrischen Eigenschaften konnte in der Nähe von 250 K nachgewiesen werden.
Journal of Physics: Condensed Matter, 2000
ABSTRACT Changes in the velocity and attenuation coefficient of quasilongitudinal waves propagati... more ABSTRACT Changes in the velocity and attenuation coefficient of quasilongitudinal waves propagating in a TGSe crystal in the directions z' = z-4° and x, induced by uniaxial stress σx and σy, were measured in the temperature range of the ferroelectric phase transition. The uniaxial stress applied was found to shift the phase transition temperature by ∂TC/∂σx = -0.074 and ∂TC/∂σy = -0.18 K MPa-1. Other effects appearing under the influence of external stress, such as a change in the jump of the wave velocity at the phase transition, increase in the attenuation coefficient and broadening of the phase transition range, are discussed on the basis of the phenomenological theory. The relaxation time of the order parameter fluctuations was determined. For stress exceeding 2 MPa an additional anomaly in the wave velocity and attenuation appeared, which was interpreted as a splitting of the phase transition. The nonlinear elastic effects at the phase transition, in the para- and ferroelectric phases, are also discussed.
Ferroelectrics, 2002
Results of the surface phonon velocity V R measurements in three ferroelastic crystals {Gd 2 (MoO... more Results of the surface phonon velocity V R measurements in three ferroelastic crystals {Gd 2 (MoO 4 ) 3 , LiCsSO 4 and Rb 4 LiH 3 (SO 4 ) 4 } over the temperature range covering their transitions are presented. No significant elastic softening was observed in the course of our studies. In a few cases an anomalous increase of V R at T C was observed. The observed behavior may be attributed to the properties of the surface layer, which in the case Brillouin scattering experiment, is penetrated to about 300 nm from the surface.
Ferroelectrics, 1989
A bismuth sodium titanate,(BiNa) 1/2 TiO3 (BNT)-based solid solutions,(1− x)(BiNa) 1/2TiO3+ x (a·... more A bismuth sodium titanate,(BiNa) 1/2 TiO3 (BNT)-based solid solutions,(1− x)(BiNa) 1/2TiO3+ x (a· SrTi03+ b· PbTiO3+ c· CaTiO3)(a+ b+ c= l),(BNTX [100x-100a/100b/100c]), were studied for their dielectric, piezoelectric and pyroelectric properties. X-ray diffraction ...
The third harmonic generation of ferroic (NH 2 (C 2 H 5) 2) 2 CuCl 4 diethylammonium cuprate chlo... more The third harmonic generation of ferroic (NH 2 (C 2 H 5) 2) 2 CuCl 4 diethylammonium cuprate chlorate (DEACC) single crystals and nanocrystals (NCs) incorporated into polymethyl methacrylate (PMMA) polymer matrices was investigated. It was established that the crystal field spectra of Cu 2+ ion determines the observed size dependence effect. The role of nanocrystallite size and content
Materials Letters, 2011
We studied an influence of uniaxial pressure on the triglycine selenate single crystals during si... more We studied an influence of uniaxial pressure on the triglycine selenate single crystals during simultaneous illumination by the continuous wave 532 laser at power about 300mW. Simultaneously we have studied two-photon absorption for the nanosecond 1064nm Nd:YAG laser fundamental wavelength. The studies were performed during several cycles of applied uniaxial pressure. A correlation between the photoinduced absorption and the two-photon
Ferroelectrics Letters Section, 2015
Journal of Materials Science: Materials in Electronics, 2012
ABSTRACT Photo-induced treatment of L-alanine single crystals grown by slow evaporation method at... more ABSTRACT Photo-induced treatment of L-alanine single crystals grown by slow evaporation method at an ambient temperature was performed using a 25 ps Nd:YAG pulsed laser in the presence of an external acoustic filed. The changes of the absorption were studied for the wavelength 265 nm near the energy band gap edge at acoustical power density varying within 4–6 W/cm 2 . The observed absorp-tion changes indicate that the external optical electric field strengths and acoustical power densities may be efficient parameters for the characterization of photo-optical and acousto-optical treatment of the samples. From the X-ray diffraction data we have optimized the atomic positions assuming that force on the atoms is around 1 mRy/au. These are used to calculate the electronic structure and the chemical bonding for the amino acid L-alanine single crystals. The calculated electronic band structure and densities of states confirms the experimental results that this compound possesses a relatively large energy band gap. The upper valence band has its maximum at the Z point of the Brillouin zone while the conduction band minimum is located at C point in the zone center, resulting in an indirect energy band gap. The electronic energy gap is equal to 4.19 eV within a framework of the used local density approximation and 4.54 eV with the Engel–Vosko generalized gradient approximation as the exchange correlation potential. This is in an agreement with our experimentally measured energy band gap *4.67 eV. The existence of O-p character in the upper valence band has a significant consequence for the optical band gap. From our calculated electron charge density distribution, we obtain a space electron charge density distribution in the average unit cell of the crystal. The chemical bonding features of L-alanine amino acid were analyzed.
We argue that "L-valine ferric chloride" crystal reported by Geetha et al [Curr. Appl. ... more We argue that "L-valine ferric chloride" crystal reported by Geetha et al [Curr. Appl. Phys. 15 (2015) 201-207] is not a new nonlinear optical material but instead a dubious crystal.
Physical Review B, 2011
... Anna Gagor and Adam Pietraszko W. Trzebiatowski Institute of Low Temperature and Structure Re... more ... Anna Gagor and Adam Pietraszko W. Trzebiatowski Institute of Low Temperature and Structure Research PAS, PO Box 1410, PL-50-950 Wroclaw, Poland ... 2011 American Physical Society Page 2. MACIEJ WOJTA S et al. PHYSICAL REVIEW B 83, 144103 (2011) ...
Ferroelectrics Letters Section, 2000
ABSTRACT Changes in the velocity and attenuation coefficient of quasi-longitudinal waves propagat... more ABSTRACT Changes in the velocity and attenuation coefficient of quasi-longitudinal waves propagating in TGSe crystal in the direction X induced by uniaxial stress σY were measured in the temperature range of ferroelectric phase transition. The application of uniaxial stress was found to shift the phase transition temperature by ∂TC/∂σY = −0.18 K/MPa. For the stress greater than 2 MPa an additional anomaly in the wave velocity and attenuation appears, which has been interpreted as a splitting of the phase transition.
Crystal Research and Technology, 2005
Physical Review Letters, 2001
Frontiers of Physics, 2019
This collection presents 505 papers on ferroelectricity in single crystals, ceramics and polymers... more This collection presents 505 papers on ferroelectricity in single crystals, ceramics and polymers in which pointed or elliptical hysteresis loops would testify to their ferroelectric properties. In some papers, the authors ensure that ferroelectricity can occur even in materials that do not have a polar axis of symmetry.
We argue that "L-valine ferric chloride" crystal reported by Geetha et al [Curr. Appl. ... more We argue that "L-valine ferric chloride" crystal reported by Geetha et al [Curr. Appl. Phys. 15 (2015) 201-207] is not a new nonlinear optical material but instead a dubious crystal.
Journal of Thermal Analysis and Calorimetry, 2015
We argue that the 'tris thiourea chromium(III) sulphate' crystal (Madhurambal et al. in
Journal- Korean Physical Society
High resolution Brillouin spectroscopy has been used to study the elastic properties of K2ZnCl4 c... more High resolution Brillouin spectroscopy has been used to study the elastic properties of K2ZnCl4 crystal in the temperature range from 100 to 300 K in order to establish the temperature behaviour of elastic sti�ness tensor components. Ten Brillouin modes have been observed for the phonons propagating in the six directions. All phonon velocities reveal di�erent anomalies at the phase transition (T0 = 144.7 K). The obtained results allowed a calculation of the temperature dependence of elastic constants of the prototype phase. A comparison of the presented results with the earlier low-frequency data indicates a strong relaxational character of the order parameter in K2ZnCl4 and the anomalous dispersion behaviour of quasilongitudinal and quasitransverse phonons propagating along the [110] direction.
Physica Status Solidi (a), 1996
ABSTRACT Elastic and piezoelectric properties of MAPCB crystals have been studied in the temperat... more ABSTRACT Elastic and piezoelectric properties of MAPCB crystals have been studied in the temperature range 110 to 310 K. A correlation between changes in the elastic properties and anomalies in the spontaneous polarization of the crystals at 170 K is found. No anomaly in the piezoelectric properties in the vicinity of the newly postulated phase transition at 250 K has been detected.Die elastischen und piezoelektrischen Eigenschaften von MAPCB-Kristallen im Temperaturbereich 110 bis 310 K wurden gemessen. Es wurde eine Korrelation zwischen den Änderungen der elastischen Eigenschaften und der Anomalie der spontanen Polarisation bei 170 K gefunden. Keine Anomalie der piezoelektrischen Eigenschaften konnte in der Nähe von 250 K nachgewiesen werden.
Journal of Physics: Condensed Matter, 2000
ABSTRACT Changes in the velocity and attenuation coefficient of quasilongitudinal waves propagati... more ABSTRACT Changes in the velocity and attenuation coefficient of quasilongitudinal waves propagating in a TGSe crystal in the directions z' = z-4° and x, induced by uniaxial stress σx and σy, were measured in the temperature range of the ferroelectric phase transition. The uniaxial stress applied was found to shift the phase transition temperature by ∂TC/∂σx = -0.074 and ∂TC/∂σy = -0.18 K MPa-1. Other effects appearing under the influence of external stress, such as a change in the jump of the wave velocity at the phase transition, increase in the attenuation coefficient and broadening of the phase transition range, are discussed on the basis of the phenomenological theory. The relaxation time of the order parameter fluctuations was determined. For stress exceeding 2 MPa an additional anomaly in the wave velocity and attenuation appeared, which was interpreted as a splitting of the phase transition. The nonlinear elastic effects at the phase transition, in the para- and ferroelectric phases, are also discussed.
Ferroelectrics, 2002
Results of the surface phonon velocity V R measurements in three ferroelastic crystals {Gd 2 (MoO... more Results of the surface phonon velocity V R measurements in three ferroelastic crystals {Gd 2 (MoO 4 ) 3 , LiCsSO 4 and Rb 4 LiH 3 (SO 4 ) 4 } over the temperature range covering their transitions are presented. No significant elastic softening was observed in the course of our studies. In a few cases an anomalous increase of V R at T C was observed. The observed behavior may be attributed to the properties of the surface layer, which in the case Brillouin scattering experiment, is penetrated to about 300 nm from the surface.
Ferroelectrics, 1989
A bismuth sodium titanate,(BiNa) 1/2 TiO3 (BNT)-based solid solutions,(1− x)(BiNa) 1/2TiO3+ x (a·... more A bismuth sodium titanate,(BiNa) 1/2 TiO3 (BNT)-based solid solutions,(1− x)(BiNa) 1/2TiO3+ x (a· SrTi03+ b· PbTiO3+ c· CaTiO3)(a+ b+ c= l),(BNTX [100x-100a/100b/100c]), were studied for their dielectric, piezoelectric and pyroelectric properties. X-ray diffraction ...
The third harmonic generation of ferroic (NH 2 (C 2 H 5) 2) 2 CuCl 4 diethylammonium cuprate chlo... more The third harmonic generation of ferroic (NH 2 (C 2 H 5) 2) 2 CuCl 4 diethylammonium cuprate chlorate (DEACC) single crystals and nanocrystals (NCs) incorporated into polymethyl methacrylate (PMMA) polymer matrices was investigated. It was established that the crystal field spectra of Cu 2+ ion determines the observed size dependence effect. The role of nanocrystallite size and content