SN-119-MOSSBAUER, IR, AND DSC STUDY OF TIN OXYFLUORIDE GLASSES

The Sn-119-Mossbauer spectra of xSnO.(70-x)SnF2.3OP(2)O(5) glasses (0 less than or equal to x less than or equal to 70) measured at 78 K comprised a doublet due to Sn2+ (delta = 3.30-3.36 mm s(-1), Delta = 1.70-1.72 mm s(-1)) and a weak singlet due to Sn4+ located at -0.23 mm s(-1) with respect to BaSnO3. The delta and Delta of Sn2+ were comparable to those of Sn2P2O7. Small Debye temperatures (146 and 155 K) were obtained from the low-temperature measurements. These results indicate that Sn2+ and Sn4+ occupied interstitial sites, being loosely and ionically bonded to distorted PO4-xFx tetrahedra.