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crystal data
Chemical preparations and crystal data are described for five new tetrametaphosphates: CaK2P4O12, PbK2P4O12, PbRb2P4O12, Pb(NH4)2P4O12 and PbTl2P4O12. All of them are tetragonal and isotypic with SrK2P4O12. The space group is I with Z = 2.