Mixed Ba5.24Sr0.76Mg7F26

Kubel, F.; Hagemann, H.; Bill, H.

doi:10.1107/S0108270197009931

Mixed Ba_5.24Sr_0.76Mg₇F₂₆

In orthorhombic Ba₆Mg₇F₂₆, the Ba²⁺ ion can be partially replaced by Sr²⁺ to form a mixed, disordered compound. This new compound has a refined composition of Ba_5.24 (4)Sr_0.76 (4)Mg₇F₂₆. The volume decreases after the partial substitution from 1074.64 (10) to 1064.31 (11) Å³. The structure has two barium sites, Ba1 on Wyckoff site 8(l) with C_s symmetry and a coordination number of 12 + 1, and Ba2 on site 4(j) with C_2v symmetry and a coordination number of 12; only the Ba²⁺ on site 4(j) is partially replaced by Sr²⁺. The distorted octahedral fluoride environment around magnesium shows a tendency to become more irregular in the Sr-substituted compound.

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Mixed Ba_5.24Sr_0.76Mg₇F₂₆

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	Crystallographic Information File (CIF) Contains datablocks global, BASR6
	Structure factor file (CIF format) Supplementary material