Abstract
The relaxation of the initial permeability has been measured in polycrystalline Ba hexaferrites with the initial composition of W-type (BaMexFe18–xO27, with Me: Ti, Sn, in the substitution range 0 < x < 1). The samples, prepared by means of standard ceramic techniques, correspond to different phases, changing from W phase at lower doping rate to M phase with x = 1. In the temperature range between 80 and 420 K, the magnetic disaccommodation, i. e., the time decay of the initial permeability after sample demagnetization, is represented by means of isochronal curves. They show the presence of up to four relaxation processes whose maxima lie at 375 K, 300 K, 240 K and 180 K (resp. A, B, C and D peaks). With increasing doping content, the C, D and A processes vanish. The results are interpreted in terms of ionic reorientations of ferrous cations and lattice vacancies in the different metallic sites of the hexagonal close packed lattice, and the phase transitions with increasing doping content; in this way magnetic disaccommodation can be a valuable tool in the ellucidation of phase formation in the hexaferrite family. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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