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Hydrothermal synthesis and sintering of nickel and manganese-zinc ferrites

Published online by Cambridge University Press:  31 January 2011

Anderson Dias  and
Vicente Tadeu Lopes Buono
Anderson Dias*
Affiliation:
Departamento de Engenharia Metalúrgica e de Materiais, Escola de Engenharia-UFMG, Rua Espírito Santo, 35/sala 206, 30160–030, Belo Horizonte, MG, Brazil
Vicente Tadeu Lopes Buono
Affiliation:
Departamento de Engenharia Metalúrgica e de Materiais, Escola de Engenharia-UFMG, Rua Espírito Santo, 35/sala 206, 30160–030, Belo Horizonte, MG, Brazil
*
a)Author to whom correspondence should be addressed.
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Abstract

The influence of the starting materials on the crystalline phases observed after hydrothermal synthesis of nickel and manganese-zinc ferrites was investigated. The combination of sulfates and sodium hydroxide showed the best results for the conditions studied. The morphological parameters of MnZn ferrites produced at different hydrothermal conditions (110–190 °C, 4–30 h) were analyzed. Changes in lattice parameter, particle size, density, size and total volume of pores, and in the surface area of the particles were analyzed as a function of temperature and processing time. The sintering process was employed in order to verify the reactivity of the hydrothermal powders at controlled atmosphere. High density and surface homogeneous ceramic bodies were obtained, without zinc volatilization. Lattice parameter variations were associated with changes in the cations distribution of the spinel during sintering.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 12 , December 1997 , pp. 3278 - 3285
Copyright
Copyright © Materials Research Society 1997

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