Crystal structure of the low-temperature phase of β Cu1.75Se analysed by electron diffraction

被引：7

作者：

Okada, Y ^{[1
]}

Ohtani, T ^{[1
]}

Yokota, Y ^{[1
]}

Tachibana, Y ^{[1
]}

Morishige, K ^{[1
]}

机构：

[1] Okayama Univ Sci, Fac Sci, Okayama 7000005, Japan

来源：

JOURNAL OF ELECTRON MICROSCOPY | 2000年 / 49卷 / 01期

关键词：

copper selenide; order-disorder transition; phase transition; electron diffraction; X-ray diffraction; resistivity;

D O I：

10.1093/oxfordjournals.jmicro.a023788

中图分类号：

TH742 [显微镜];

学科分类号：

摘要：

The beta phase of Cu1.75Se has an anti-fluorite structure, where one in eight tetrahedral copper sites are vacant. Powder X-ray diffraction measurements on Cu1.75Se showed that the beta phase transformed to a two-phase mixture of (alpha + beta) at similar to 250 K, and then the beta phase changed to a new phase at similar to 180 K. Powder X-ray and electron diffraction measurements revealed that the low-temperature phase of the beta phase has a superstructure of (2a(fcc)x2a(fcc)x2a(fcc)) type, where a(fcc) is the lattice parameter of the original beta phase. The superstructure was interpreted to originate from the ordering copper vacancies. The new phase was referred to as the beta' phase.

引用

页码：25 / 29

页数：5

共 9 条

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