Abstract
Crystallization processes of partially devitrifled glass obtained by rapid quenching of 0·175 MnO + 0·175. Fe2O3 + 0·65 B2O3 melt were studied by DTA and X-ray analyses and the temperature regions of nucleation, crystallization and decompozition of the spinel phase were established. The magnetization curves measured between 4·2 and 250 K in magnetic fields up to 42 kOe divided the samples into two groups: the original as cast glass and those annealed below the crystallization temperature, as well as above the decomposition temperature showed essentially paramagnetic behaviour, whereas those annealed closely above the crystallization temperature displayed a spontaneous magnetic moment. The former ones could not be classified as superparamagnetic but the temperature dependence of their susceptibility could be explained by interactions of the antiferromagnetic type. The comparison of lattice parameter and Curie temperature of the latter one with crystalline Mn x Fe3-x O4, system indicated pronounced iron enrichment of the spinel phase formed during heat treatment.
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The authors thank Mrs. A.Hadincová for the help with the evaluation of the results.
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Závěta, K., Bergstein, A., Roskovec, V. et al. Magnetic properties of partially devitrified B2O3-MnFe2O4 glass. Czech J Phys 23, 837–844 (1973). https://doi.org/10.1007/BF01587278
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DOI: https://doi.org/10.1007/BF01587278