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Benefits of Mild Wet Milling of the Intermediates for the Synthesis of Phase-pure Z-type Hexaferrite

Published online by Cambridge University Press:  01 August 2005

Jadambaa Temuujin*
Affiliation:
Department of Applied Chemistry, Faculty of Science and Technology, Keio University, Yokohama 223-8522, Japan
Masami Aoyama
Affiliation:
Department of Applied Chemistry, Faculty of Science and Technology, Keio University, Yokohama 223-8522, Japan
Mamoru Senna
Affiliation:
Department of Applied Chemistry, Faculty of Science and Technology, Keio University, Yokohama 223-8522, Japan
Taisuke Masuko
Affiliation:
Materials Research and Development Division, General Research and Development Laboratories, Taiyo Yuden Co., Ltd., Gunma 370-3347, Japan
Chie Ando
Affiliation:
Materials Research and Development Division, General Research and Development Laboratories, Taiyo Yuden Co., Ltd., Gunma 370-3347, Japan
Hiroshi Kishi
Affiliation:
Materials Research and Development Division, General Research and Development Laboratories, Taiyo Yuden Co., Ltd., Gunma 370-3347, Japan
*Corresponding
a) Address all correspondence to this author. e-mail: jtemuujin@yahoo.com
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Abstract

A comparative study on the wet and dry milling of the intermediates for the Z-type hexagonal ferrite (Ba3Co2Fe24O41, Z phase) was performed. Phase-pure Z phase was synthesized by wet milling the intermediates comprising M and Y-type hexaferrites. The intermediates were obtained by calcining the stoichiometric powder mixture at 1080 °C. Subsequent wet milling by a planetary mill for 1 h increased the crystallization rate of Z phase upon subsequent heating at 1230 °C. In contrast, dry milling the intermediates resulted in the severe surface amorphization and led to heterogeneous crystalline states. The observed favorable effect of wet milling the intermediates was explained by the particle size reduction for the decrease of diffusion distance while preserving the basic layer units common to the related hexaferrites.

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Rapid Communications
Copyright
Copyright © Materials Research Society 2005

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Benefits of Mild Wet Milling of the Intermediates for the Synthesis of Phase-pure Z-type Hexaferrite
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