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crystal data
Crystal data are given for both α and β forms of barium dichromate, BaCr2O7. The α form is monoclinic (C2/c) with a = 16.29 (5), b = 16.63 (5), c = 9.456 (1) Å; β = 92.52 (5)° and Z = 16. The β form, isotypic with SrCr2O7 and PbCr2O7, is tetragonal (P42/nmc) with a = 11.72 (5), c = 9.440 (3) Å and Z = 8.