Thermal Products in the System of NaPO₃ Glass-MoO₃

Abstract

Glassy and crystalline substances in NaPOs-MoOg system with P/Mo ratios from O.1 to 300were prepared by heating of NaPOs glass and molybdenum trioxide mixtures at 580, 700, or 750gC. The products were smbjected. to paper-chromatograPhic analysis, X-ray diffractometric measurement, and IR spectrophotometitic measurement. The prodqcts prepared at 580eC with PIMo ratios from O.1to 3. contained crystallin6 sodiummolybdenum oxide phosphate(NaMo02PO4). Since the average chain length of condensed phosphates present in the products increased with increasing P/Mo ratio, it could be concluded that NaPO391ass reacted with molybdenum trioxide to form P-O-Mo linkage, Assuming that the glassy products with P/Mo ratios larger than 5.0 had P P, P-O, P-O-Mo, and Mo-O linkage C a theoretical treatment of the degree of polymerizatien of condens. ed phosphates has. been made and compayed, with the experimental data, and reasonable chemical structure of glasses in NaPOs-MoO5 system were concluded as MoO2(PO)2, MoO2(PO)g, or MoO2(PO) The absorption at 870N930 cm-i in IR Spectra of the products with P/Mo ratios smaller than 5.0 were conSidered to be due to P-O-Mo /stretching.