Acta Cryst. (2007). E63, i156 [ doi:10.1107/S1600536807027821 ]
Abstract: Single crystals of lutetium oxide bromide, LuOBr, were obtained accidentally as a by-product of the reaction of lutetium metal, ruthenium powder and lutetium tribromide, LuBr3, in a sealed tantalum container. As is typical for rare-earth oxide halides of the type REOX (RE = rare-earth metal and X = halogen), LuOBr crystallizes in the tetragonal PbFCl structure type (matlockite), where Lu, O and Br are situated on positions with 4mm, 
m2 and 4mm symmetry, respectively.
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