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A Numerical Investigation of the Effect of Cubic Crystals Orientation on the Indentation Modulus

100%
Materna A., Haušild P., Nohava J.
Acta Physica Polonica A
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2015
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vol. 128
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issue 4
693-696
EN
The elastic finite element computations of the indentation process with the Berkovich indenter are performed to examine the effect of cubic crystal and indenter orientation on indentation moduli of anisotropic material. Three metals with a cubic crystal lattice and various degree of elastic anisotropy from 1 to 9 are studied: tungsten, AISI 304 steel and β -brass. Differences in anisotropy ratios expressed by the Young moduli on the one side and by the indentation moduli on the other side are quantified.
2
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Impact of Different Conditions of Technological Process on Thermoelectric Properties of Fine-Grained PbTe

100%
Królicka A., Materna A., Piersa M., Mirowska A.
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EN
The aim of this work was to obtain PbTe material in the desired way in order to control the combined impact of lattice disorder, nanoscale precipitates and reduced grain sizes on the thermoelectric properties of this material. To achieve this, PbTe ingot doped with Ag was obtained by the Bridgman method, followed by ball-milling, cold pressing and sintering. In order to estimate crystallites diameters grain size measurements were carried out using the optical microscopy. Studies of electrical and thermoelectric properties of fine-grained material were performed. In order to analyze the morphology and the composition scanning electron microscopy and energy-dispersive X-ray spectroscopy were performed. Energy-dispersive X-ray spectroscopy analysis also revealed presence of Ag-Te precipitates.
3
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Influence of Chemical Composition of Liquid Phase and Growth Process on Physical Properties of Bi_2Se_3, Bi_2Te_3 and Bi_2Te_2Se Compounds

64%
Hruban A., Materna A., Dalecki W., Strzelecka G., Piersa M., Jurkiewicz-Wegner E., Diduszko R., Romaniec M., Orłowski W.
Acta Physica Polonica A
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2011
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vol. 120
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issue 5
950-953
EN
We studied synthesis and crystal growth of Bi_2Te_3, Bi_2Se_3 and Bi_2Te_2Se compounds by means of vertical Bridgman method. Crystals were grown from stoichiometric melts and under different molar ratio of Bi:Te, Bi:Se or Bi:Te:Se. The obtained crystals were characterized by X-ray diffraction analysis, energy dispersive X-ray spectroscopy, scanning electron microscopy, atomic force microscopy, and the Hall effect measurements. Some of the samples demonstrated insulating bulk behavior, by means of resistivity versus temperature measurements.
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