The local structure of Fe 2 O 3 –TeO 2 –B 2 O 3 –SrF 2 glasses was studied by recording the EPR and IR absorption spectra. Structural changes and increasing glass stability were evidenced with the addition of Fe 2 O 3 in the sample. The distribution of isolated paramagnetic ions in sites of strongly distorted octahedral symmetry was detected at low concentration (up to 3 mol% Fe 2 O 3 ) by means of EPR measurements. For x>3 mol% Fe 2 O 3 , the clustered iron ions become progressively preponderent in the system. Mixed valence states of iron ions involved in dipole–dipole and superexchange type interactions were also evidenced. The IR spectra analysis revealed the BO 3 , BO 4 and B 2 O 6 units in the structure of tellurite investigated glasses. Among these structural units, those containing the threefold boron atoms are predominant.
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Ardelean et al. (2000) studied this question.
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