REDUCED MOLYBDENUM PHOSPHATES - SYNTHESIS, CHARACTERIZATION AND MAGNETIC-PROPERTIES

A synthetic pathway to obtain pure phases of reduced molybdenum phosph ates in air is described. Starting from mixtures of MoO3 and (NH4)2HPO 4 with different molar ratios Mo/P, and controlling the time and tempe rature of heating, the compounds: MoOPO4, (MoO)2P4O13, MoP2O and Mo(PO 3)3 have been prepared. Their spectroscopic and magnetic properties ar e discussed on the basis of the structural features. Both a significan t effect of the spin-orbit coupling and the existence of antiferromagn etic interactions, propagated via the \PO4\ groups, have been observed .