The colourless compounds Li3OBr and Li7O2Br3 have been prepared and characterized by X-ray diffraction techniques. Li3OBr crystallizes in a cubic primitive lattice (Pm3m) with a = 405.6(1) pm (Z = 1). The structure is related to the anti-perovskite type. Li7O2Br3 crystallizes in a tetragonal bodycentered lattice (I4/mmm) with a = 403.5(1) pm, c = 2161(1) pm (Z = 2) and is isotypic to Sr3Ti2O7.
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Wortmann et al. (1989) studied this question.
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