Magnetic and microstructural studies of Ca-hexaferrite based glass-ceramics

Ram, S. ; Bahadur, D. ; Chakravorty, D. (1988) Magnetic and microstructural studies of Ca-hexaferrite based glass-ceramics Journal of Non-Crystalline Solids, 101 (2-3). pp. 227-242. ISSN 0022-3093

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X-ray diffraction, magnetisation and EPR measurements have been carried out on the glass-ceramic specimens of CaO---Fe2O3---B2O3 based glass systems. The results are explained on the basis of their microstructures. In a system, 13CaO---48Fe2O3---39B2O3, CaFe2O4 is found to crystallise as a magnetic phase having a surprisingly large magnetisation (85 emu/g). The actual composition of this phase is believed to be Ca0.6Fe2.4O4 with Fe2+ and Fe3+ ions distributed among the different available sites in a particular way. CaFe12O19 and Ca3Fe15O25 ferrites can be crystallised with useful magnetic properties in the systems containing (1 mol%) Ag2O or P2O5 as nucleating agent. Incorporation of As2O3 (0.1 mol%) in the P2O5 system gives rise to the crystallisation of Ca3Fe15O25 particles in platelet shape with an aspect ratio ~12. The crystallisation behaviour and microstructural features of the systems are consistent with the EPR linewidths and g-values.

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Source:Copyright of this article belongs to Elsevier Science.
ID Code:7385
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