Physico-chemical study of Ge(Pb)Te-Bi2(Sb2)Te3 system ternary compounds

Skoropanov, A.S.; Valevsky, B.L.; Skums, V.F.; Samal, G.I.; Vecher, A.A.

doi:10.1016/0040-6031(85)87110-0

Cited by 13 publications

(4 citation statements)

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“…Table 5 also shows the values of the enthalpy of formation of the GeBi4Te7, and GeBi2Te4 compounds obtained by the quantitative DTA method [29]. These values are 20-25% lower compared to our data.…”

Section: Tablementioning

confidence: 40%

“…of the Ge-Bi-Te system Phase fG (298 K) fH (298 K) (298 K) kJ/mol J/molK GeTe [46] 52.9 ± 0.1 49.5 ± 0.4 91.1 ± 1.4 Bi2Te3 [31] 76.9 ± 0.2 79.2 ± 0.5 254.2 ± 3.0 β (Ge0.05Bi1.9Te2.9) 77. formula units of GeBi4Te7, and GeBi2Te4. In our opinion, the relatively low values of the standard heats of formation of these compounds [29] can be associated with nonequilibrium of the samples. Unfortunately, in [29], there are no specific data on the synthesis conditions and identification of the studied GeBi4Te7, and GeBi2Te4 samples, the preparation of which is a single-phase form, as shown above, is associated with certain difficulties.…”

Section: Standard Integral Thermodynamic Functions Of Binary and Tern...mentioning

confidence: 79%

“…In our opinion, the relatively low values of the standard heats of formation of these compounds [29] can be associated with nonequilibrium of the samples. Unfortunately, in [29], there are no specific data on the synthesis conditions and identification of the studied GeBi4Te7, and GeBi2Te4 samples, the preparation of which is a single-phase form, as shown above, is associated with certain difficulties.…”

Section: Standard Integral Thermodynamic Functions Of Binary and Tern...mentioning

confidence: 79%

“…In the literature, we have found only one work on the thermodynamic study of germanium-bismuth tellurides, carried out by the method of quantitative differential thermal analysis [29]. Taking this into account, we undertook a comprehensive study of phase equilibria and thermodynamic properties of the GeTe-Bi2Te3-Te system by the method of electromotive forces (EMF).…”

Section: Introductionmentioning

confidence: 99%

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Solid-phase equilibria in the GeBi2Te4-Bi2Te3-Te system and thermodynamic properties of compounds of the GeTe·mBi2Te3 homologous series

Alakbarova

Orujlu

Бабанлы³

et al. 2022

Phys. Chem. Solid St.

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The GeBi2Te4-Bi2Te3-Te system was investigated by XRD and EMF measurements of the reversible concentration cell of the type (-) GeTe (solid) │glycerol +KCl │ Ge-Bi-Тe (solid) (+) in the 300-450K temperature range. It was shown that, in the indicated temperature range, elementary tellurium forms tie lines with all telluride phases of the system. Equations for the temperature dependencies of EMF in all phase regions have been obtained from the data of EMF measurements, from which the partial thermodynamic functions of GeTe in alloys have been calculated. The partial molar functions of germanium in alloys were determined by combining obtained data with the thermodynamic functions of GeTe. Standard Gibbs free energy and enthalpy of formation, as well as the standard entropy of the GeBi2Te4, GeBi4Te7, GeBi6Te10 compounds and solid solutions based on Bi2Te3 have been calculated using these data, solid-phase equilibrium diagram of the GeBi2Te4-Bi2Te3-Te system, and corresponding thermodynamic functions of Bi2Te3.

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Section: Tablementioning

confidence: 40%