CRYSTAL-CHEMISTRY AND ELECTROCONDUCTIVITY OF THE M(X)ZR(2.25-0.25X)(PO4)(3) (M=LI, NA, K, RB, CS) BINARY PHOSPHATES OF THE NZP STRUCTURE

Crystallographic properties of phosphates of the formula M(x)Zr(2.25 - 0.2x)(PO4)(3) (M = Li, Na, K, Rb, CS; x(min) = 1,x(max) = 7) are gene ralized. The electroconduction of these phosphates is studied. Paramet ers of unit cells of the synthesized phases, which crystallize to trig onal systems of the R (3) over tilde c symmetry, are shown to change i n a regular manner. Electroconductivity of solid phases M(x)Zr(2.25 - 0.25x)(PO4)(3) is determined by migration of the M cations through the NZP structure and amounts to 10(-3) to 10(-8) S cm(-1) in the tempera ture range of 250 to 400 degrees C.