MOSSBAUER-SPECTROSCOPY OF A SEMICONDUCTIVE PHOSPHATE-GLASS (10V(2)O(5)-30FE(2)O(3)-60P(2)O(5)) AT LOW-TEMPERATURE

In order to clarify the difference between the local structures of Fe3 + and those of Fe2+ ions in a semiconductive phosphate (10V(2)O(5)-30F e(2)O(3)-60P(2)O(5),0,) glass, the temperature dependencies of the iso mer shift (IS), quadrupole splitting (QS) and absorption area (AR) for Fe3+ and Fe2+ ions were measured. Debye temperatures (theta(D)) for F e3+ and Fe2+ ions were determined to be 318 +/- 29 K and 223 +/- 18 K, respectively, from the temperature dependence of the absorption area (AR). From the temperature dependence of the quadrupole splitting (QS) , B strength parameters for Fe3+ and Fe2+ ions, which are the coeffici ents for the T-3/2 term, were deduced. It was found that in this phosp hate glass, Debye temperatures BD(AR) were consistent with those obtai ned using the relation of the B parameter to Debye temperature describ ed in the literature. Also from the temperature dependence of the isom er shift, the difference between the thermal effects except the second -order Doppler shift for Fe3+ ions and those for Fe2+ ions was compare d.