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Papers by Tomasz Goryczka

Journal of Materials Engineering and Performance

The Ni50Ti50 and Ti50Ni25Cu25 alloys were produced in the form of powder using the high-energy ba... more The Ni50Ti50 and Ti50Ni25Cu25 alloys were produced in the form of powder using the high-energy ball milling. In the as-milled state, both alloys revealed presence of an amorphous state with a small amount of nanocrystalline areas. The non-isothermal DSC heating curves were used to investigate the crystallization process. Temperatures and activation energy of crystallization were determined. In both alloys, the crystallization occurred at temperatures range from 777 to 813 K, dependently on the heating rate. The activation energy values determined by the Kissinger and Ozawa method were comparable for both alloys and ranged from 410 to 429 kJ/mol.

Molecules

Studies carried out by X-ray and thermal analysis confirmed that acetaminophen (paracetamol), dec... more Studies carried out by X-ray and thermal analysis confirmed that acetaminophen (paracetamol), declared by the manufacturers as an Active Pharmaceutical Ingredient (API), was present in all studied medicinal drugs. Positions of diffraction lines (2θ angles) of the studied drugs were consistent with standards for acetaminophen, available in the ICDD PDF database Release 2008. |Δ2θ| values were lower than 0.2°, confirming the authenticity of the studied drugs. Also, the values of interplanar distances dhkl for the examined samples were consistent with those present in the ICDD. Presence of acetaminophen crystalising in the monoclinic system (form I) was confirmed. Various line intensities for API were observed in the obtained diffraction patterns, indicating presence of the preferred orientation of the crystallites in the examined samples. Thermal analysis of the studied substances confirmed the results obtained by X-ray analysis. Drugs containing only acetaminophen as an API have melt...

Journal of Solid State Chemistry

Materials

The authors wish to make the following corrections to this paper [...]

Archaeological and Anthropological Sciences

The paper deals with a couter of a late fourteenth to early fifteenth century date which was foun... more The paper deals with a couter of a late fourteenth to early fifteenth century date which was found in Ogrodzieniec Castle, Zawiercie District, Poland (now in the collection of the Upper Silesian Museum in Bytom, MG 7755). The find survived in a vestigial condition, but it was still possible to propose some typological analogies to it. Metallographic examinations demonstrated that the artefact had been manufactured from almost carbon-free iron with a high content of phosphorus. An analysis of slag inclusions in the find suggests that the couter may have been made from refined blast furnace iron. It may thus be an early example of the application of indirect process iron in the manufacture of plate armour.

Journal of Alloys and Compounds

Warsaw, September 19-22, 2008, 2000

ABSTRACT Combination of the X-ray and electron back scattered diffraction techniques was applied ... more ABSTRACT Combination of the X-ray and electron back scattered diffraction techniques was applied for characterization of the Ni-Ti shape memory alloy produced by twin roll casting. The Ni-Ti alloy revealed presence of the one-step reversible martensitic transformation. The transformation occurs between the B2 parent phase and the B19' monoclinic martensite. Columnar as well as fine grains formed at the surface were preferentially oriented along < 100 >, < 110 > and {100}< 001 > textural components. As a consequence of the high texture about 40% of grain boundaries were coincident. Especially, Sigma 5, Sigma 13a and Sigma 17a boundaries were formed.

Shape Memory Alloys - Processing, Characterization and Applications, 2013

Materials Chemistry and Physics, 2016

$Research paper thumbnail of Crystallite Size Determination of MgO Nanopowder from X-Ray Diffraction Patterns Registered in GIXD Technique$

Diffusion and Defect Data Solid State Data Part B Solid State Phenomena, 2010

The problem of the crystallite size determination for nanomaterials from X-ray diffraction data o... more The problem of the crystallite size determination for nanomaterials from X-ray diffraction data obtained in asymmetrical GIXD geometry was analyzed. The studies were performed on nanocrystalline MgO powder prepared by sol-gel synthesis. The nanopowder was preliminary characterized from X-ray diffraction pattern registered in classical Bragg-Brentano geometry and electron microscope observation. The estimated crystallite size, calculated form Williamson-Hall method, equals to 5 nm whereas the lattice distortion is negligible (0.1%). The X-ray diffraction patterns were registered in 30-135º 2θ range using tunnel GIXD technique for the incident α angle: 0.25; 0.5; 1; 2.5 and 5 degrees, respectively. Additional broadening of diffraction lines originated from applied geometry was observed. The calculated crystallite size deviate significantly in comparison to results obtained from classical Bragg-Brentano data. Corrections for additional line broadening were determined, which should be applied for accurate crystallite size calculation in studies of thin nanocrystalline layers using GIXD technique.

Solid State Phenomena, 2009

Journal of Alloys and Compounds, 2006

Chemical Physics Letters, 2010

... Full Text via CrossRef. [4] R. Praveena, R. Vijaya and CK Jayasankar, Spectrochim. Acta A 70 ... more ... Full Text via CrossRef. [4] R. Praveena, R. Vijaya and CK Jayasankar, Spectrochim. Acta A 70 (2008), p. 577. Article | PDF (537 K) | View Record in Scopus | Cited By in Scopus (19). [5] G. Seeta Rama Raju and S. Buddhudu, Spectrochim. Acta A 70 (2008), p. 601.

Diffusion and Defect Data Solid State Data Part B Solid State Phenomena, Apr 1, 2009

The studies were carried out on three Ni-Mn-Ga polycrystalline alloys with the 10M martensite and... more The studies were carried out on three Ni-Mn-Ga polycrystalline alloys with the 10M martensite and the L21 parent phase. The specimens were cut along the [001] and [110] directions of the columnar grains from the ingots of either round or flat shape. The samples were heated up to 10000C and rolled in one direction in several steps. The final reduction of the samples thickness was: 28%, 36%, 57% and 69%. The texture of the initial [001] orientation rolled with the highest deformation 60% shows the following orientation components: {111}<112>, {112}<011>, {111}<011> which are typical for deformed and recrystallized metals of the A2 structure. The texture of the specimen with the initial [110] orientation rolled with 69% can be described as a fibre texture scattered around the <110> direction.

Materials Science Forum, 1994

Solid State Phenomena, 2007

The polycrystalline Cd0.5Ge0.5Cr2Se4 and CdCr1.9Ge0.075Se4 compounds were obtained using ceramic ... more The polycrystalline Cd0.5Ge0.5Cr2Se4 and CdCr1.9Ge0.075Se4 compounds were obtained using ceramic method. X-ray analysis was used to make phase and structure analysis. The Rietveld method was applied for structure refinement. Both compounds crystallized in cubic, normal spinel structure, Fd 3m. Besides the main spinel phase, Cr2Se3 was observed.