Abstract
Mössbauer, EPR and magnetization experiments have been carried out on the glass composition Na2O-SiO2-Fe2O2-Y2O3 in which yttrium iron garnet (YIG) can be precipitated by suitable heat-treatment. The measurements have been carried out on the as-quenched sample as well as samples heat-treated for 4 h at 400, 500, 600, 650, 700, 750, 810 and 850‡ C. Mössbauer spectra from the as-quenched sample as well as the first six samples showed a quadrupole splitting while the last two samples, as well as the sample heat-treated (i) by a two-stage process at 600‡ C and then at 750‡ C for 4 h each, and (ii) at 700‡ C for 40 h, showed a hyperfine as well as quadrupole splitting. The behaviour of the isomer shift (IS) and quadrupole splitting (δE) with the heat-treatment temperature show significant changes at the glass transition and crystallization temperatures. The Mössbauer data have been found consistent with optical and electron micrographs which show a large variation in particle size of the precipitated magnetic phase. This has been further correlated with EPR and magnetization data.
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Prasad, A., Bahadur, D., Singru, R.M. et al. Study of Na2O-SiO2-Fe2O2-Y2O3 glass by Mössbauer and EPR spectroscopy. J Mater Sci 17, 2687–2692 (1982). https://doi.org/10.1007/BF00543905
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DOI: https://doi.org/10.1007/BF00543905