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Structural Transformations in Three-Dimensional Crystalline GeSe2 at High Pressures and High Temperatures

✍ Scribed by Andrzej Grzechnik; Svein Stølen; Egil Bakken; Tor Grande; Mohamed Mezouar

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
234 KB
Volume
150
Category
Article
ISSN
0022-4596

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✦ Synopsis

Germanium diselenide GeSe 2 is studied in situ at the pressure range 2+6 GPa using angle-dispersive X-ray di4raction in a large volume Paris+Edinburgh cell. The structure at 2 GPa and 698 K, solved with direct methods in the I4 space group (a ‫؍‬ 5.5073(3) A s s , c ‫؍‬ 9.9374(8) A s s , Z ‫؍‬ 4), is three dimensional with all the GeSe 4 tetrahedra sharing their corners. Anomalous lattice expansion along the c axis with increasing pressure and pressure-induced structural variations are explained by anisotropic lattice distortions due to cooperative tiltings of the rigid GeSe 4 units.

2000 Academic Press

EXPERIMENTAL

The sample of GeSe was prepared by heating stoichiometric amounts of high-purity elements (Goodfellow, UK;

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