X-ray diffraction and electron microscopy studies of the room-temperature structure of Cu2Se
- 10 November 1988
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 21 (31) , 5329-5336
- https://doi.org/10.1088/0022-3719/21/31/004
Abstract
The structural phase transition of cuprous selenide has been studied by means of X-ray diffraction, electron diffraction and high-resolution transmission electron microscopy. The room-temperature phase is pseudo-monoclinic (a=c=7.14 AA approximately=1/2ac(112), b=81.9 AA approximately=8ac(111) and beta =120 degrees , where ac is the lattice constant in the high-temperature cubic phase). The structure is characterised by a periodic array of vacant tetrahedral and nearby interstitial copper atoms. A simplified structural model is presented for the arrangement of vacant copper sites; the vacancies occupy the 312/*31/2 units in the (111)c basal planes, and these vacancy layers are stacked every four copper layers, forming a ladder-like structure.Keywords
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