Thermal, mechanical, electrical and thermoelectric properties of Bi–As–Se glasses

Dahshan, A.; Alharbi, S. R.; Aly, K.A.; Saddeek, Yasser B.

doi:10.1007/s10973-019-08810-8

“…3). Also, the measurements results showed that, in addition to reproducibility, the numerical values of the EMF increase in the radial directions from Tm vertex of the Tl-Tm-Te concentration triangle, which is in agreement with the well-known thermodynamic principle [47,48]. ()…”

Section: Resultssupporting

confidence: 81%

“…For design and optimization of the synthesis and the growth of the single crystal conditions besides the phase diagram, accurate data of the thermodynamic functions are required [43][44][45][46]. Usually, the method of differential scanning calorimetry is used to determine the thermal effects of phase transformations and the heat capacity [47,48]. At the same time, the method of electromotive forces (EMF) has found wide application in practice due to the simplicity of measurements and their high accuracy.…”

Section: Introductionmentioning

confidence: 99%

Untitled

2021

Bull. of the Kar. Univ. "Chem". Ser.

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The article is dedicated to the 70th anniversary of Sarkyt Elekenovich Kudaibergenov, a prominent Kazakh scientist-chemist. His career and the most significant events of his scientific life are briefly described here. The contribution of Professor S.E. Kudaibergenov to the development of physical chemistry of polymers and his participation in the internationalization of the polymer scientific school are shown.This article is devoted to the 70th anniversary of Sarkyt Elekenovich Kudaibergenov, a prominent Kazakh scientist-chemist. S.E. Kudaibergenov is an internationally recognized expert in the field of physical chemistry of polymers, Doctor of Chemical Sciences (1991), Professor (1994), Laureate of the Kazakh SSR State Prize in Science and Technology (1987).Professor S.E. Kudaibergenov is an enthusiastic person who has been inspiring his colleagues and a large number of young researchers working in the field of polymer science for several decades. His fundamental scientific works mainly devoted to the physical chemistry of hydrophilic polymers, stimulated significant progress in this field [1][2][3][4][5][6].After graduating from the Faculty of Chemistry at Kazakh State University named after Kirov (now Al-Farabi Kazakh National University) in 1973, Sarkyt Kudaibergenov remained at this university as an engineer and then as a research intern. His academic career continued at the Institute of Chemical Sciences of the Academy of Sciences of the Republic of Kazakhstan in the Laboratory of Physical Chemistry of Polymers led by Academician E.A. Bekturov, a distinguished chemist. A truly important milestone in the career of Professor S.E. Kudaibergenov was the work on a candidate dissertation on the topic "Hydrodynamic properties of polyelectrolytes based on vinylethylpiperidoles-4", which he successfully defended in 1980. This work anticipated his innovative research on the development of the physical chemistry of polyelectrolytes [7, 8]. Studies of polymer complexation reactions were one of the many contributions that S.E. Kudaiberegenov made for the development of polymer science.One of his first co-authored monographs "Polymer Complexes and Catalysts" describes the interaction of macromolecules with metal ions, explains the mechanisms and conditions of formation of polymer-metal complexes, which have great theoretical interest and practical application [9]. In this book the catalytic properties of some macromolecular compounds in solutions, which are models of biocatalyst-enzymes, are also described.

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“…3). Also, the measurements results showed that, in addition to reproducibility, the numerical values of the EMF increase in the radial directions from Tm vertex of the Tl-Tm-Te concentration triangle, which is in agreement with the well-known thermodynamic principle [47,48]. Alloy designations are the same as in Figure 1.…”

Section: Resultssupporting

confidence: 80%

“…For design and optimization of the synthesis and the growth of the single crystal conditions besides the phase diagram, accurate data of the thermodynamic functions are required [43][44][45][46]. Usually, the method of differential scanning calorimetry is used to determine the thermal effects of phase transformations and the heat capacity [47,48]. At the same time, the method of electromotive forces (EMF) has found wide application in practice due to the simplicity of measurements and their high accuracy.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic study of the thallium-thulium tellurides by EMF method

Imamaliyeva¹,

Mekhdiyeva²,

Jafarov³

et al. 2021

Bull. of the Kar. Univ. "Chem". Ser.

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In this study the phase equilibria in the Tl2Te–Tl2Te3–TlTmTe2compositions area of the Tl–Tm–Te ternary system were studied by powder X-ray diffraction (PXRD) analysis. Based on PXRD data, the solid-phase equi-libria diagram was plotted. The thermodynamic functions of the Tl9TmTe6and TlTmTe2ternary compounds were calculated by the electromotive forces method. The electrochemical cells of the following type (−) TmТе (s.) | glycerol + KCl + TmCl3 | (Tm in alloys of Tl–Tm–Te system) (s.) (+) were assembled and their EMF were measured in the 300-450 Ktemperature range. Based on obtained EMF data for the Tl2Te3–TlTe–TlTmTe2and TlTe–TlTmTe2–Tl9TmTe6three-phase regions, the relative partial thermodynamic functions of TmTe in alloys were calculated. The combination of these functions with the partial molar functions of thulium in TmTe allowed calculating the corresponding partial functions of thulium in the above phase regions. The potential-forming reactions responsible for the indicated partial molar values were obtained based on con-structed solid-phase equilibria diagram. Using indicated potential-forming reactions, for the first time, the standard thermodynamic functions of formation and standard entropies of the Tl9TmTe6and TlTmTe2 compounds were calculated.

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