For the first time, single crystals of KPbBP 2 O 8 with sizes up to 18 ϫ 13 ϫ 6 mm have been grown from a stoichiometric mixture of its components by the top seed growth method. The crystal structure was determined from single-crystal Xray data: tetragonal, space group I42d, a = 7.1464(7) Å, c = 13.8917(16) Å, Z = 4. It exhibits an isolated [BP 2 O 8 ] 3unit that is built from nearly ideal tetrahedral BO 4 and PO 4 groups,[a] Xinjiang
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