Polymorphic Transformations and Thermal Expansion in AgCuSe0.5(S, Te)0.5 Crystals

被引：21

作者：

Aliyev, Y. I. ^{[1
]}

Asadov, Y. G. ^{[1
]}

Aliyeva, R. D. ^{[1
]}

Jabarov, S. H. ^{[1
]}

机构：

[1] Natl Acad Sci Azerbaijan, Abdullaev Inst Phys, AZ-1073 Baku, Azerbaijan

来源：

SEMICONDUCTORS | 2017年 / 51卷 / 06期

关键词：

D O I：

10.1134/S1063782617060045

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The high-temperature X-ray diffraction technique is used to study AgCuSe0.5(S,Te)(0.5) crystals. It is shown that, at room temperature, the AgCuSe0.5S0.5 crystal is composed of Cu1.96S and AgCuSe phases. At a temperature of 695 K, these phases transform into a single face-centered cubic (fcc) phase. The transformation is reversible. The AgCuSe0.5Te0.5 composition consists of three phases, specifically, Cu2Te, AgCuSe, and a cubic phase. At 444 K, both orthorhombic phases simultaneously transform into a diamond-like cubic phase. In this transformation, the cubic phase plays the role of a seed. From the temperature dependence of the lattice parameters, the thermal-expansion coefficients of the phases involved in both compositions are calculated for the main crystallographic directions.

引用

页码：732 / 739

页数：8

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