Abstract
The shape of the \ensuremath{\gamma} resonance absorption peak of the ${\mathrm{Eu}}^{3+}$ ion in a disordered structure was investigated in some phosphate, borate, and silicate glasses by using $^{151}\mathrm{Eu}$ M\ossbauer spectroscopy. The quality of the fits was tested by using the Durbin-Watson d statistics. The observed full width at half maximum of the peak was resolved in a contribution of the broadening and a contribution of the quadrupole splitting, due to the distortion of the Eu site compared to a cubic symmetry. The Eu-O bond was found to have a covalent admixture with 6s character. The axial component of the electric-field gradient at the Eu site was found to be correlated with the optical basicity of the glass. \textcopyright{} 1996 The American Physical Society.
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