Synthesis and structure of zirconium and 3d-transition metal phosphates M0.5Zr2(PO4)(3) (M = Mn, Co, Ni, Cu, Zn)

Double zirconium and 3d-transition metal phosphates of the compositions M0. 5Zr2(PO4)(3) [M = Mn (I) Co (II), Ni (III), Cu (IV), Zn (V)] have been synt hesized and the types of their structures have been refined: Compounds I, I I, III, IV, and V are all monoclinic (sp. gr. P2(1)/n, Z = 4) and have the unit cell parameters a = 12.390(3), 12.389(3), 12.385(3), 12.389(3), 12.389 (2) Angstrom; b = 8.931(4), 8.928(3), 8.924(4), 8.925(4), 8.929(3) Angstrom ; c = 8.843(3), 8.840(2), 8.840(3), 8.841(3), 8.842(2) Angstrom, beta = 90. 55(1), 90.54(1), 90.53(1), 90.53(1), 90.54(1)degrees; V = 978.5, 977.7, 977 .0, 977.4, 978.1 Angstrom(3), respectively. All the structures have the {[Z r-2(PO4)(3)](-)}(3 infinity)-type frameworks. The crystallographic data for 3d-transition and alkali earth metal phosphates described by the general f ormula M0.5Zr2(PO4)(3) are compared. (C) 2000 MAIK "Nauka/Ineteriodica".