On the phase transition of chalcocite Cu2S thin films
On the phase transition of chalcocite Cu2S thin films
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DOI：
10.1002/pssa.2210670138
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发表时间：
1981-09
期刊：
影响因子：
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通讯作者：
M. León;N. Terao;F. Rueda
中科院分区：
文献类型：
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作者：
M. León;N. Terao;F. Rueda
Buerger 和 Buerger/1/ 通过 X 射线衍射研究了块状材料中辉铜矿的相变。在 105 ℃ 时观察到从斜方辉铜矿到六方相的转变，斜方相和六方相的晶格常数分别为 a= 11. 90 8，b= 2 7.28 8，c= 1 3.41'A，a= 3.89 1，c= 6.68 8。 Rastogi 和同事/2/通过电子衍射和电导率研究了真空蒸发获得的薄膜的相变。他们在 57 ℃ 观察到从斜方辉铜矿到六方晶系的相变。 Evans/3/ 表明低温相是单斜晶系，晶格常数 a= 15.246 1、b= 11.884 x、c= 13.494 8、fi= 116.35'。本工作补充了先前作者的观察结果，特别表明对于通过真空蒸发硫化亚铜 CuxS (1.75< x< 2) 获得的辉铜矿薄膜，在真空中的后热退火中，单晶中的六方-单斜相转变遵循拓扑关系，其中低温相采用以高温相的超结构为基本结构的超结构。确定了变换矩阵。
The phase transitions of chalcocite have been studied in bulk material by Buerger and Buerger/1/by X-ray diffraction. A transition was observed from orthorhombic chalcocite to hexagonal at 105 OC, having the lattice constants a= 11. 90 8, b= 2 7.28 8, c= 1 3.41'A, and a= 3.89 1, c= 6.68 8 for the orthorhombic and hexagonal phases, respectively. Rastogi and coworkers/2/have studied by electron diffraction and electrical conductivity the phase transitions of thin films obtained by evaporation in vacuum. They observed a phase transition at 57 OC from orthorhombic chalcocite to the hexagonal form. Evans/3/has shown that the low-temperature phase is monoclinic with lattice constants a= 15.246 1, b= 11.884 x, c= 13.494 8, fi= 116.35'.The present work complements the observations of the previous authors and shows in particular that for chalcocite thin films obtained by vacuum evaporation of cuprous sulphide CuxS (1.75< x< 2) and posterior thermal annealing in vacuum, the transition hexagonal-monoclinic in single crystal follows a topotactic relation where the low-temperature phase takes a superstructure having as basic structure that of the high-temperature phase. The transformation matrix was determined.