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Your search keyword '"A. F. Prekul"' showing total 3 results
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3 results on '"A. F. Prekul"'

1. Ordering effect on the mechanical, electronic and magnetic properties of the β-based non-canonical approximant phases: β-Al50Cu33Fe17, η-Al50Cu44Fe6 and φ-Al47.5Cu49.5Fe3

Author

Sergey Smirnov, I. O. Selyanin, A. F. Prekul, N. I. Medvedeva, E. O. Smirnova, E. V. Shalaeva, and N. I. Shchegolikhina

Subjects
Diffraction, Materials science, Structure (category theory), Ab initio, 02 engineering and technology, Electronic structure, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, Crystallography, Non canonical, Transmission electron microscopy, Indentation, 0103 physical sciences, Domain (ring theory), 010306 general physics, 0210 nano-technology
Abstract

Using transmission electron microscopy and X-ray diffraction, we established that the ordered η1-Al50Cu44Fe6 and φ-Al47.5Cu49.5Fe3 (Fmm2) alloys with nano-sized domain structure are formed by slowl...

Published
2017
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2. On nature of the excess heat capacity in icosahedral quasicrystals

Author

Keiichi Edagawa, N. I. Shchegolikhina, and A. F. Prekul

Subjects
Crystallography, Excess heat, Icosahedral symmetry, Chemistry, Phase (matter), Quasicrystal, Thermodynamics, Charge carrier, Condensed Matter Physics, Heat capacity
Abstract

Experimental evidence is presented which indicates that the total heat capacity in the Al63Cu25Fe12 icosahedral phase contains a contribution associated with inconstancy of the charge carrier concentration. The contribution has an oscillating temperature dependence and is supposedly traceable to two Schottky-like heat anomalies.

Published
2010
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3. Thermally activated conductivity in Ti-based alloys exhibiting negative TCR

Author

A. F. Prekul, A. S. Shcherbakov, and R. V. Pomortsev

Subjects
Metal, Materials science, Transition metal, Condensed matter physics, Electrical resistivity and conductivity, General Chemical Engineering, visual_art, visual_art.visual_art_medium, General Physics and Astronomy, Condensed Matter::Strongly Correlated Electrons, Activation energy, Conductivity
Abstract

The temperature dependences of resistivity of a number of transition metal Ti-based alloys have been studied in detail. It is shown that the conductivity of these alloys consists of three additive contributions, viz. (1) a T-independent metallic part, (2) a thermally activated part which obeys the Mott T 1/4 law, and (3) a thermally activated part with T-independent activation energy. This coexistence of metallic and thermally activated conductivities is quite unusual and requires a theoretical explanation.

Published
1983
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