反向
衍射
转化(遗传学)
结晶学
反射(计算机编程)
黛比
多重性(数学)
材料科学
化学
数学
几何学
物理
光学
凝聚态物理
计算机科学
生物化学
基因
程序设计语言
作者
Yu. G. Asadov,G. A. Jabrailova
出处
期刊:Kristall und Technik
[Wiley]
日期:1973-01-01
卷期号:8 (4): 499-505
被引量:7
标识
DOI:10.1002/crat.19730080413
摘要
Abstract Structural transformations in Cu 2 Se have been studied by the method of hightemperature roentgenography. From a diffraction record of reflection angles and from a Debye‐powder pattern the unit‐cell parameters of a rhombic α‐modification have been calculated at temperatures of 25, 50, 100, and 132 °C. Using the diffraction line (027) disappearing under the α → β transformation and appearing again in the course of the inverse β → α transformation it has been found that the equilibrium temperature between the α‐ and β‐modifications is T 0 = 134 ± 0.5 °C. The unit cell parameter of a hightemperature face‐centered cubic β‐modification at temperatures of 150, 200, 250, and 300 °C also has been determined. In the course of mutual transformations a rigid orientational linkage has been found to exist between the α‐ and β‐modifications. It has been discovered that when the multiplicity of α → β and β → α transformations n reaches a value of approximately 30, a β‐Cu 2 Se → Cu 2 – x Se transformation (where x = 0.20) takes place which is not followed by an inverse transformation.
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