CRYSTAL-STRUCTURE INVESTIGATION OF TERNARY MOLYBDATE K-5(MN0.5ZR1.5)CENTER-DOT(MOO4)(6)

Crystals of K-5(Mn0.5Zr1.5).(MoO4)(6) were grown, and the crystal stru cture of this compound was refined in an X-ray diffraction study (CAD- 4 automatic diffractometer, MoKalpha radiation 1183 \F(hkl)\, R = 0.02 7). The parameters of the trigonal unit cell are: a = b = 10.584(1); c = 37.576(3) Angstrom; V = 3645.4(3) Angstrom(3); space group R3c; d(c alc) = 3.606 g/cm(3). In the structure, the alternating Mo tetrahedra and (Mn, Zr) octahedra form a three-dimensional mixed framework whose voids contain potassium atoms of three types. The distribution of the Mn and Zr cations in two crystallographic positions has been refined.