CRYSTAL-STRUCTURE INVESTIGATION OF TERNARY MOLYBDATE K(MG0.5ZR0.5)CENTER-DOT(MOO4)(2)

Crystals of K(Mg0.5Zr0.5).(MoO4)(2) were grown, and the composition an d crystal structure of the compound were refined in an X-rey diffracti on study (CAD-4 automatic diffractometer, MoKalpha radiation, 475 F(hk l), R = 0.022). The parameters of the trigonal unit cell are: a = 5.76 3(1); c = 7.187(1) Angstrom Z = 1, space group P (3) over bar m1. A ty pical feature of a glaserite-like structure is atomic arrangement in t wo layers: at z = 0 the Mg and Zr atoms are statistically distributed in the oxygen octahedra, and at z = 0.5 the K atoms are distributed in side the icosahedra. In the second layer, Mo atoms with tetrahedral en vironment are also distributed.