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Phase equilibria of the GeTe−Bi2Te3 quasi-binary system in the range 0–50 mol% Bi2Te3
Phase Transitions ( IF 1.3 ) Pub Date : 2021-06-08 , DOI: 10.1080/01411594.2021.1937625
T. M. Alakbarova 1 , Hans-Jürgen Meyer 2 , E. N. Orujlu 3 , I. R. Amiraslanov 4 , M. B. Babanly 3
Affiliation  

ABSTRACT

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.



中文翻译:

GeTe-Bi2Te3 准二元体系在 0-50 mol% Bi2Te3 范围内的相平衡

摘要

GeTe-Bi 2 Te 3准二元体系的GeTe-GeBi 2 Te 4部分在700-1000 K温度区间通过使用PXRD、DTA和SEM技术以及相图的相应片段进行了重新检查被建造。系统中确认了4种三元化合物的存在。包晶反应形成的Ge 2 Bi 2 Te 5 (863 K)和GeBi 2 Te 4 (854 K)化合物,而Ge 3 Bi 2 Te 6和Ge 4 Bi 2 Te 7通过固相反应分解。该系统的特征还在于基于 GeTe 的两种变体形成大面积的固溶体。此外,菱形→立方同形相变发生在 9 和 10 mol% Bi 2 Te 3组成之间。立方相的均匀场在 700 K 下不超过 2-3 mol%,并且随着 Bi 2 Te 3浓度的增加形成层状相。三元化合物以及固溶体的结晶参数通过 Rietveld 方法确定。对获得的结果与文献数据进行比较分析。

更新日期:2021-06-18
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