Effects of pH control on preparation of Z-type hexagonal ferrite Ba 3Co2Fe24O41 by polymerized complex method

Makoto Nakanishi, Asako Akiyama, Tatsuo Fujii, Jun Takada, Takeyuki Kikuchi, Yoshihiro Kusano

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The formation process of Z-type hexagonal ferrite, Ba3Co 2Fe24O41, prepared by polymerized complex method and the effects of pH control of citrate complex solution were investigated. By heating a precursor, a pyrolyzed complex polymer, spinel phase, M-type ferrite and Y-type ferrite were formed sequently with increasing the heating temperature. By heating up to 1200°C, monophasic Z-type ferrite was not synthesized in usual preparation procedures. So pH of citrate complex solution was changed and the effects on formation process were examined. As ammonia solution was added to change the complex solution from acidic to basic, the phases in the pyrolysate changed form barium carbonate to barium nitrate and the crystallinity of the constituent phases decreased. By controlling pH to 11, monophasic Z-type ferrite was obtained by heating at 1200°C. On the other hand, pH control of the complex solution toward basic condition suppressed the formation of Y-type ferrite. It was revealed that the optimum conditions for preparing the complex solution depended on phases even for same Ba-Co-Fe-O system.

Original languageEnglish
Title of host publicationElectroceramic Materials and Applications - Proceedings of the 6th Pacific Rim Conference on Ceramic and Glass Technology
Pages435-440
Number of pages6
Publication statusPublished - Dec 1 2006
Event6th Pacific Rim Conference on Ceramic and Glass Technology - Maui, Hawaii, United States
Duration: Sep 11 2005Sep 16 2005

Publication series

NameCeramic Transactions
Volume196
ISSN (Print)1042-1122

Other

Other6th Pacific Rim Conference on Ceramic and Glass Technology
CountryUnited States
CityMaui, Hawaii
Period9/11/059/16/05

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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