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Science 5 February 1971:
Vol. 171. no. 3970, pp. 485 - 487
DOI: 10.1126/science.171.3970.485
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Articles

Xenon Hexafluoride: Structural Crystallography of Tetrameric Phases

R. D. Burbank 1 and G. R. Jones 1

1 Bell Telephone Laboratories, Murray Hill, New Jersey 07974

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 sim 10°C to phase II (orthorhombic, 16 XeF6 units per cell), which in turn transforms at sim -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.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)