PREPARATION, STRUCTURAL CHARACTERIZATION AND CONDUCTIVITY OF LITIXZR2-X(PO4)3

Amorphous compounds of formula LiTixZr2-x(PO4)3, with x ranging from 0.25 to 2, have been prepared in aqueous media and crystallized at 900°C. Single phases have been obtained only for x≤0.25 and x≥1.5 and their X-ray powder patterns indexed on the basis of monoclinic and hexagonal cells, respectively. The cell volume per unit formula decreases linearly with increasing x. The ionic conductivity of these materials, determined by impedance measurements on pellets, lies in the range 4×10-3-3×10-4S cm-1 at 300°C; the activation energy for conduction gradually decreases from 0.7 to 0.43 eV as the Ti content is increased. © 1990.