Abstract
Mossbauer spectra were measured for a series of alkaline earth phosphate and borate glasses with mole % composition (100-X) P2O5+X MeO+SnO2 (where Me=Mg, Ca, Sr or Ba and X=20, 24 or 28). The results were analyzed as a function of glass composition and tin atoms valence state. The descrease in the isomer shift (IS) value with the increase of the alkaine earth oxide content was attributed to an increase in the ionic strength of bonds around the tin ions. The increase of the quadrupole splitting (QS) and line width (LW) values with the gradual increase of alkaline earth oxide content were attributed to be due to an asymmetric and irregular distribution of alkaline earth ions around the tin ions. The asymmetry in the absorption peak is due to Goldanskii effect. The tin was found only in the quadrivalent state.
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