Influence of the Addition of Bi2O3 on the Grain Growth and Magnetic Permeability of MnZn Ferrites

• Published in: Journal of the American Ceramic Society Vol. 81; no. 11; pp. 2841 - 2848
• Main Authors: Drofenik, Miha, Znidarsic, Andrej, Makovec, Darko
• Format: Journal Article
• Language: English
• Published: Westerville, Ohio American Ceramics Society 01.11.1998; Blackwell; Wiley Subscription Services, Inc
• Subjects: Applied sciences; Building materials. Ceramics. Glasses; Ceramic industries; Chemical industry and chemicals; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Electrotechnical and electronic ceramics; Exact sciences and technology; Ferrimagnetics; Magnetic properties and materials; Physics; Studies of specific magnetic materials; Technical ceramics; Bismuth Oxides; Grain growth; Mechanical properties; Zinc Oxides; Experimental study; Oxide ceramics; Grain boundary; Ferrimagnetic materials; Iron Oxides; Ferrite materials; Additive; Quaternary compound; Magnetic permeability; Manganese Oxides; Microstructure; Electroceramics
• ISSN: 0002-7820; 1551-2916
• DOI: 10.1111/j.1151-2916.1998.tb02704.x

Additions of Bi2O3 were used to promote grain growth and to increase magnetic permeability during sintering of MnZn ferrites. The results showed that small additions of Bi2O3 of <0.05 wt% remarkably increase the permeability of MnZn ferrites. On the other hand, addition of 0.05 wt% Bi2O3 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 Bi2O3 concentrations, above 0.2 wt%, the grain growth was retarded and a normal microstructure appeared; however, the magnetic permeability was strongly reduced.