The chemistry of the phosphates of barium and tetravalent cations in the 1 : 1 stoichiometry

摘要

The chemistry of phosphates of barium and tetravalent cations [BaMIV(PO4)(2)] is reviewed. Such phosphates crystallise in the C2/m space group for M-IV = Ti, Zr, Hf, Ge, Sn, and Mo, and in the P2(1) space group for BaTh(PO4)(2). The existence of BaMIV(PO4)(2) in which M-IV = Pb, Ce, and U is further evaluated. Several aspects, such as phase transitions in the compounds with yavapaiite structure, solid solutions of BaMIV(PO4)(2) compounds and practical applications are briefly discussed. (C) 2007 Elsevier Inc. All rights reserved.