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Title: Influence of heat treatment on cobalt ferrite ceramic powders
Title of periodic: Materials Science and Engineering
Authors: Silva, Juliana Batista da (Centro de Desenvolvimento da Tecnologia Nuclear/CDTN, Belo Horizonte, MG, Brasil
Brito, Walter de
Mohallem, N. D.S.
Affiliation: Centro de Desenvolvimento da Tecnologia Nuclear/CDTN, Belo Horizonte, MG, Brasil
Universidade Federal de Minas Gerais/UFMG, Belo Horizonte, MG, Brasil
Issue Date: 2004
Keywords: Cobalt;ferrites;powders;porous materials;heat treatments
Abstract: Nanocrystalline CoFe2O4 powders were synthesized using metallic nitrates dispersed in aqueous media precipitated by stoichiometric amount of NH4OH. The obtained amorphous powder was washed, dried at 80 C degress and heat-treated at various temperatures for 2 h for crystallization of the material. The influence of heat treatment on the texture and morphology of the cobalt ferrite powder was studied. The specific surface area varied from 150 to 1m2g-1 while the average crystalline size varied from 17 to 100 mm with the annealing temperature. The corresponding saturation magnetization value at room temperature varied from 25.9 to 60.3 emu g_1 and the coercivity increases up to 1.5 kOe when the crystallite size reached 94nm and dropped up to 0.54 kOe with the increase in crystalline size.
Access: L
Appears in Collections:Artigo de periódico

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