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BaY2Si3O10 has a monoclinic structure with space group P21/m and lattice constants of a = 5.399(1) Å, b = 12.179(2) Å, c = 6.852(1) Å, ¦Â =106.37(3)o, V = 432.28(14) Å3, and Z = 2.
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