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Figure 4 Bond-valence analysis of the structures of Ca5Zr3F22 (top) and Sr5Zr3F22 (bottom) using parameters for solids (RZr—F = 1.854, RCa—F = 1.842, RSr—F = 2.019) from Brese & O'Keeffe (1991). It should be noted that the atom labelling in the two isotypic structures is different.

Journal logoCRYSTALLOGRAPHIC
COMMUNICATIONS
ISSN: 2056-9890
Volume 68| Part 4| April 2012| Page i23
doi:10.1107/S1600536812008495
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