Study of strontium ferrites substituted by lanthanum on the structural and magnetic properties

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Publication Details

Author list: Onreabroy W., Papato K., Rujijanagul G., Pengpat K., Tunkasiri T.

Publisher: Elsevier

Publication year: 2012

Volume number: 38

Issue number: SUPPL. 1

Start page: S415

End page: S419

ISSN: 0272-8842

eISSN: 1873-3956

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84655162128&doi=10.1016%2fj.ceramint.2011.05.023&partnerID=40&md5=c392079443626c299a3740a28a1b458a

Languages: English-Great Britain (EN-GB)

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Abstract

M-type strontium ferrites, Sr 0.8La 0.2Fe 12O 19 have been synthesized by conventional ceramic process. The effects of lanthanum addition and sintering temperature on microstructures and magnetic properties of SrFe 12O 19 and Sr 0.8La 0.2Fe 12O 19 samples were investigated. Microstructural analysis of the SrFe 12O 19 and Sr 0.8La 0.2Fe 12O 19 specimens, sintered at different temperatures revealed that average grain sizes of SrFe 12O 19 ferrites were larger than that of Sr 0.8La 0.2Fe 12O 19 ferrite and increased with increasing sintering temperature. The X-ray diffraction (XRD) results confirmed the strontium hexagonal ferrite phase of SrFe 12O 19 and Sr 0.8La 0.2Fe 12O 19 compounds. A maximum coercivity value of 4850 Oe and maximum saturation magnetization value of 102 emu/g were obtained for the SrFe 12O 19 ferrite sintered at 1150ฐC and for the SrFe 12O 19 and Sr 0.8La 0.2Fe 12O 19 ferrites sintered at 1300ฐC, respectively. The remanence (Mr) of Sr 0.8La 0.2Fe 12O 19 sample sintered at 1200ฐC possesses the maximum value of 60 emu/g. ฉ 2011 Elsevier Ltd and Techna Group S.r.l.

Keywords

A. Sintering, C. Magnetic properties, D. Ferrites, E. Hard magnets