HONG, Y. K.; JUNG, H. S.; HUR, N. P.; MATAR, Samir F.

doi:10.1051/jp4:19971127

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HONG, Y. K.
Research Center

JUNG, H. S.
Research Center

HUR, N. P.
Research Center

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Journal de Physique IV Proceedings. 1997, vol. 07, n° C1, p. C1-321-C1-322

EDP Sciences

Résumé en anglais

A reduction process of the substituted Ba-ferrite has been found to be devided into three steps. At the first and second steps, the magneto-plumbite structure maintains and the coercivity increases. When the reduced-substituted Ba-ferrite particles are reoxidized, the coercivity is reversible in the first step but irreversible in the second step. During the third step, the magneto-plumbite structure was collapsed with formation of α-Fe and BaFeOs-x phases and consequently the coercivity distribution was broad and the coercivity irreversible. The coercivity and saturation magnetization decreases and increases up to 130 emu/g respectively. In this study, it is found that the substituted cations prevent the magneto-plumbite structure from collapse during the reduction process and furthermore migrate from the magnetic sites of 4fIV+2a, 2b, and 12k to 4fVI and 12k'. An increase in the coercivity before the collapse of magneto-plumbite structure is attributed to the migration of substituted cations in hexagonal Ba-ferrite structure.< Réduire

Mots clés en anglais

Barium

Ferrites

Hydrogen

Chemical reduction

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The Effects of Hydrogen Reduction on Magnetic Properties of Barium Ferrite Particles

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