Improved magnetic properties and growth anisotropy of chemically modified Sr ferrites

Jung W. Lee, Yong S. Cho, Vasantha R.W. Amarakoon

Research output: Contribution to journalConference articlepeer-review

10 Citations (Scopus)

Abstract

Magnetic properties and microstructural characteristics of SrO·5.9Fe2O3 chemically modified with Si and Ca were investigated by changing experimental parameters such as additive composition, the ratio of Ca/Si, and sintering condition. A novel particulate coating method utilizing sol-gel reactions was used to uniformly incorporate the additives of Si and Ca. This method was very successful in obtaining homogeneous grain growth and fine grains. A sample containing the gel additives of 0.6 wt% SiO2 and 0.7 wt% CaO and sintered at 1200°C for 4 h was found to significantly suppress abnormal grain growth, resulting in submicron-sized grains and high density. A distinct grain boundary phase containing Si and Ca was observed by increasing the sintering temperature to 1250°C. The resultant microstructural characteristics favorably affected magnetic properties. For example, the chemically modified sample exhibited a higher coercivity of 3530 Oe compared to a value of 2050 Oe obtained for the sample without the additives. On the other hand, an increase in the ratio of Ca/Si or in sintering temperature tended to induce a large anisotropy during grain growth.

Original languageEnglish
Pages (from-to)5696-5698
Number of pages3
JournalJournal of Applied Physics
Volume85
Issue number8 II B
DOIs
Publication statusPublished - 1999 Apr 15
EventProceedings of the 43rd Annual Conference on Magnetism and Magnetic Materials - Miami, FL, United States
Duration: 1998 Nov 91998 Nov 12

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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