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A study on barium ferrite particles prepared by chemical coprecipitation

Published online by Cambridge University Press:  31 January 2011

W. K. Ng ,
J. Ding ,
Y. Y. Chow ,
S. Wang  and
Y. Shi
W. K. Ng
Affiliation:
Department of Materials Science, National University of Singapore, Singapore 119260
J. Ding
Affiliation:
Department of Materials Science, National University of Singapore, Singapore 119260
Y. Y. Chow
Affiliation:
Department of Materials Science, National University of Singapore, Singapore 119260
S. Wang
Affiliation:
Department of Materials Science, National University of Singapore, Singapore 119260
Y. Shi
Affiliation:
Department of Materials Science, National University of Singapore, Singapore 119260
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Abstract

Chemical coprecipitation was employed to prepare fine particles of barium ferrite with high coercivity (450 kA/m). Magnetic properties of the bonded barium ferrite magnet were measured at different temperatures. The results were found to be fairly close to the theoretical values based on the Stoner–Wohlfarth model. Mechanical milling was utilized to prepare ultrafine dispersed barium ferrite particles. NaF was introduced as a dispersing agent during milling and subsequent heat treatment. The dispersed particles were compacted and then subjected to die upsetting at room temperature. A weak anisotropy in the coercivity and remanence was found in the directions parallel and perpendicular to the compaction direction.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 10 , October 2000 , pp. 2151 - 2156
Copyright
Copyright © Materials Research Society 2000

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