Structure and Magnetic Property of FeAl2O4 Synthesized by Microwave Heating

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

Most of microwave energy transforms into thermal energy, and chemical reactions are driven by thermal energy. In the past decade, however, many studies have been reported about "microwave effect", which is difficult to explain by thermodynamics, e.g., decrystallization of the ferromagnetic materials, creating the supersaturated solid solutions, etc. In particular, it is noteworthy of the antiferromagnetic-ferromagnetic transition of a spinel ferrite. Although it is known that the microwave magnetic field (H-field) plays an important role in this process, the details are still not clear. In previous work, FeAl2O4, which is a typical antiferromagnetic spinel, was synthesized using single-mode 2.45 GHz microwave H-field irradiation and the effect of the magnetic fields on magnetic characteristics of antiferromagnetic oxide was studied. However, the authors do not reach to reveal a basic mechanism of decreasing the crystal diameter (increasing the grain boundaries) by microwave irradiation. In the study, to examine the effect of the ratio of y-Fe2O3 in starting materials for the change of magnetic properties by microwave H-field irradiation, FeAl2O4 is synthesized from 90 wt% Fe2O3-10 wt% Al2O3 mixed powder.

Original languageEnglish
Title of host publicationProcessing and Properties of Advanced Ceramics and Composites VI
Subtitle of host publicationCeramic Transactions
PublisherWiley-Blackwell
Pages293-301
Number of pages9
Volume249
ISBN (Electronic)9781118995433
ISBN (Print)9781118995495
DOIs
Publication statusPublished - 2014 Sep 15

Keywords

  • Decrystallization
  • Ferromagnetic materials
  • Microwave heating
  • Spinel ferrite
  • Thermodynamics

ASJC Scopus subject areas

  • Engineering(all)
  • Materials Science(all)

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