Magnetic glass-ceramics with hexagonal lead ferrites

Ram, S. ; Bahadur, D. ; Chakravorty, D. (1986) Magnetic glass-ceramics with hexagonal lead ferrites Journal of Non-Crystalline Solids, 88 (2-3). pp. 311-322. ISSN 0022-3093

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The crystallisation process of the different magnetic phases has been studied by suitable heat treatments of an initial glass composition of 50 PbO-20Fe2O3-30B2O3 (mol%). The nucleation and growth times have been varied to find out the optimum condition for crystallisation of the hexaferrite phases. The hexagonal lead ferrites PbFe12O19 and Pb5Fc14O26 respectively can be precipitated as the major crystalline phase in most of the samples. A maximum of ~ 60 vol.% crystallisation is achieved for the Pb5Fe14O26 ferrite phase. It also exhibits the highest coercivity ( ~3000 Oe) and magnetic moment ( ~22 emu/g). The crystallised volume fraction, microstructure and other magnetic properties are strongly dependent on the heat-treatment schedule. The presence of magnetic field has been observed to improve the crystallisation process of the ferrite glass ceramics. The magnetic and EPR data have been found to be consistent with optical and electron micrographs which show a wide spectrum of particle sizes of the precipitated magnetic particles.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:7381
Deposited On:23 Oct 2010 08:57
Last Modified:28 May 2011 05:01

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