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Die Kristallstruktur von SrCaCrF 7
Author(s) -
Holler H.,
Babel D.
Publication year - 2002
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/1521-3749(200207)628:7<1455::aid-zaac1455>3.0.co;2-#
Subject(s) - materials science
The Crystal Structure of SrCaCrF 7 By solid state reaction of the component fluorides at elevated temperature single crystals of SrCaCrF 7 were obtained (a = 792.3(2), b = 724.7(2), c = 986.1(2) pm; space group Pnma, Z = 4). The X‐ray structure determination confirmed isotypism with the Ca 2 AlF 7 type of structure: Isolated octahedra [CrF 6 ] 3— (mean Cr‐F: 189.7 pm) are opposed by infinitely netted planar cations [SrFCa 2/2 ] 3+ which contain “independent” F atoms 3‐coordinated by alkaline earth atoms only. The Sr atoms prefer (at a level of 80%) the 8‐fold, the Ca atoms the 7‐fold coordinated positions between the octahedra.