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Influence of the Addition of Bi 2 O 3 on the Grain Growth and Magnetic Permeability of MnZn Ferrites
Author(s) -
Drofenik Miha,
Znidarsic Andrej,
Makovec Darko
Publication year - 1998
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1998.tb02704.x
Subject(s) - microstructure , permeability (electromagnetism) , grain growth , sintering , materials science , grain size , abnormal grain growth , metallurgy , composite material , analytical chemistry (journal) , chemistry , chromatography , biochemistry , membrane
Additions of Bi 2 O 3 were used to promote grain growth and to increase magnetic permeability during sintering of MnZn ferrites. The results showed that small additions of Bi 2 O 3 of <0.05 wt% remarkably increase the permeability of MnZn ferrites. On the other hand, addition of 0.05 wt% Bi 2 O 3 induced the formation of a microstructure composed of giant grains with trapped pores embedded in a normal microstructure. The permeability of these samples showed a pronounced secondary maximum in permeability. At still higher Bi 2 O 3 concentrations, above 0.2 wt%, the grain growth was retarded and a normal microstructure appeared; however, the magnetic permeability was strongly reduced.