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The crystal structures of the triclinic and orthorhombic phases of Ag2Se are determined from structure images observed and their computer-simulated images. The most probable coordinates are Ag (1/4 — u 1/4 1/4; 1/4 - u 3/4 3/4; 3/4 + u 1/4 3/4; 3/4 + u 3/4 1/4; 1/4 3/4 + v 1/4; 1/4 1/4 — v 3/4; 3/4 3/4 + v 3/4; 3/4 1/4 - v 1/4) and Se (0 0 0; 0 1/2 1/2; 1/2 0 1/2; 1/2 1/2 0) in both the orthorhombic cell having the space group F222 and the triclinic cell having PI, where u = 0.04 and v = 0.12. The transformation from triclinic to orthorhombic crystals is investigated on an atomic scale in multi-beam lattice images.
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Kaito et al. (1982) studied this question.
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