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Journal of Electron Microscopy 49(1): 25-29 (2000)
© 2000 Oxford University Press

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

Yuji Okada, Tsukio Ohtani, Yasuhiro Yokota*, Yukio Tachibana and Kunimitsu Morishige

Faculty of Science, Okayama University of Science Ridai-cho 1-1, Okayama 700-0005, Japan

*To whom correspondence should be addressed

The ß 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 ß phase transformed to a two-phase mixture of ({alpha} + ß) at {small tilde}250 K, and then the ß phase changed to a new phase at {small tilde}180 K. Powder X-ray and electron diffraction measurements revealed that the low-temperature phase of the ß phase has a superstructure of (2afcc×2afcc×2afcc) type, where afcc is the lattice parameter of the original ß phase. The superstructure was interpreted to originate from the ordering copper vacancies. The new phase was referred to as the ß' phase.

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

Received     11 December 1998, accepted 14 May 1999


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