Xenon Hexafluoride: Structural Crystallography of Tetrameric Phases
- 5 February 1971
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 171 (3970) , 485-487
- https://doi.org/10.1126/science.171.3970.485
Abstract
Three crystalline phases of xenon hexafluoride are based on tetrameric association of XeF5+ and F- ions into eight-membered rings. Phase I (monoclinic, 8 XeF6 units per cell) transforms at ∼ 10°C to phase II (orthorhombic, 16 XeF6 units per cell), which in turn transforms at ∼ -25°C to phase 111 (monoclinic, 64 XeF6 units per doubly primitive cell). The transformation from phase I to phase II requires gross reorientation of half of the tetramers in the structure. The transformation from phase II to phase III involves only an ordering of right-handed and left-handed configurations.Keywords
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