Abstract
57Fe Mössbauer spectroscopy has been carried out at room temperature on oxide glasses of the binary oxide systems, i.e., BaO-Fe 2O 3, SrO-Fe 2O 3, PbO-Fe 2O, and TeO 2-Fe 2O 3 in order to estimate the distribution of electric field gradient of Fe 3+ ion sites in these materials. The Mössbauer spectra obtained experimentally were reproduced by taking into account an asymmetric non-Gaussian distribution of electric field gradient around Fe 3+ ions. From the analyses, the average value of the electric field gradient was evaluated for each glass. The average electric field gradient tends to increase monotonically with an increase in concentration of Fe 3+ ions, irrespective of kinds of glass systems. It is thought that in the present oxide glasses with larger concentration of Fe 3+ ions, more distorted local structure is required for Fe 3+ ions to take a random state.
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