Laval JP, Mayet R. High-temperature monoclinic α-SrHfF
6, and isostructural α-SrZrF
6: associating Hf
2F
12 bipolyhedra and SrF
8 snub disphenoids.
Acta Crystallogr C 2018;
74:229-235. [PMID:
29400340 DOI:
10.1107/s2053229618001110]
[Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2017] [Accepted: 01/17/2018] [Indexed: 11/11/2022] Open
Abstract
The structure of the high-temperature monoclinic variety α-SrHfF6 (strontium hafnium hexafluoride) [and of isostructural α-SrZrF6 (strontium zirconium hexafluoride)] associates Hf2F12 bipolyhedra and SrF8 snub disphenoids, forming zigzag twisted [SrF6]n layers. The distribution of the Hf and Sr polyhedra forms a three-dimensional framework which can be related to the family of anion-excess ReO3-related superstructures. α-SrHfF6 corresponds to a new ABX6 type and is compared to the other main families already described. A partial amorphization of this structure is observed in samples quenched from the melt.
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