Phase equilibria of the GeTe-Bi2Te3 quasi-binary system in the range 0-50 mol% Bi2Te3

被引：10

作者：

Alakbarova, T. M. ^{[1
]}

Meyer, Hans-Juergen ^{[2
]}

Orujlu, E. N. ^{[3
]}

Amiraslanov, I. R. ^{[4
]}

Babanly, M. B. ^{[3
]}

机构：

[1] Azerbaijan State Oil & Ind Univ, Baku, Azerbaijan

[2] Eberhard Karls Univ Tubingen, Inst Inorgan Chem, Tubingen, Germany

[3] Azerbaijan Natl Acad Sci, Inst Catalysis & Inorgan Chem, Baku, Azerbaijan

[4] Azerbaijan Natl Acad Sci, Inst Phys, Baku, Azerbaijan

来源：

PHASE TRANSITIONS | 2021年 / 94卷 / 05期

关键词：

GeTe-Bi2Te3; system; phase diagram; solid solutions; layered phases; phase transitions; morphotropic phase transitions; TETRADYMITE-LIKE COMPOUNDS; THERMOELECTRIC PROPERTIES; SCIENCE;

D O I：

10.1080/01411594.2021.1937625

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

The GeTe-GeBi2Te4 part of the GeTe-Bi2Te3 quasi-binary system was re-examined in the 700-1000 K temperature interval by using PXRD, DTA, and SEM techniques, and the corresponding fragment of the phase diagram was constructed. The existence of 4 ternary compounds is confirmed in the system. Ge2Bi2Te5 (863 K) and GeBi2Te4 (854 K) compounds formed by peritectic reactions, while Ge3Bi2Te6 and Ge4Bi2Te7 decompose by solid-phase reactions. The system is also characterized by the formation of large areas of solid solutions based on both modifications of GeTe. Besides, rhombohedral -> cubic morphotropic phase transition occurs between 9 and 10 mol% Bi2Te3 compositions. The homogeneity field of the cubic phase does not exceed 2-3 mol% at 700 K and layered phases are formed as the concentration of Bi2Te3 increases. Crystallographic parameters of ternary compounds, as well as solid solutions, were determined by the Rietveld method. A comparative analysis of obtained results with literature data is performed.

引用

页码：366 / 375

页数：10

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