Abstract
The structure of the title compound, barium lanthanum bromide (11/4/34), can be derived from the fluorite structure. The asymmetric unit contains two Ba sites (one with site symmetry 4/m..), one La site (site symmetry 4..), one mixed-occupied Ba and La site (ratio 1:1, site symmetry m..) and six Br sites (one with site symmetry \\=4.., one with 2.., one with m.., the latter being disordered over two positions with a 0.86:0.14 ratio). The fundamental building units of the structure are edge-sharing polyhedral clusters made up of Ba and La bromide clusters interconnected to BaBr8 square prisms and BaBr10 groups.
Highlights
The structure of the title compound, barium lanthanum bromide (11/4/34), can be derived from the fluorite structure
Alkaline earth halides (Cherepy et al, 2008), rare earth halides, and compounds based on such binaries (Bourret-Courchesne et al, 2009, 2010)
Are efficient scintillators when doped with divalent europium or trivalent cerium
Summary
Bourret-Courchesnea and Stephen Derenzoa a Lawrence Berkeley National Laboratory, One Cyclotron Rd, Berkeley, CA 94720, USA, and bDepartment of Chemistry and Biochemistry, University of California Santa. Key indicators: single-crystal X-ray study; T = 150 K; mean (La–Br) = 0.002 Å; disorder in main residue; R factor = 0.049; wR factor = 0.118; data-to-parameter ratio = 26.8. The structure of the title compound, barium lanthanum bromide (11/4/34), can be derived from the fluorite structure. The asymmetric unit contains two Ba sites (one with site symmetry 4/m..), one La site (site symmetry 4..), one mixedoccupied Ba and La site (ratio 1:1, site symmetry m..) and six. The fundamental building units of the structure are edge-sharing polyhedral clusters made up of. Ba and La bromide clusters interconnected to BaBr8 square prisms and BaBr10 groups. Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: RU2009)
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