The effect of heat treatment temperature on the microstructure and magnetic properties of Ba2Co2Fe12O22 (Co2Y) prepared by sol-gel method

Nimai Chand Pramanik, Tatsuo Fujii, Makoto Nakanishi, Jun Takada, Sang II Seok

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25 Citations (Scopus)

Abstract

Ferroxplana type hexagonal ferrite with composition Ba2Co2Fe12O22 (Co2Y) was prepared by polymeric sol-gel method from the aqueous solution of their corresponding metal salts. All the samples were characterized by using X-ray diffraction and scanning electron microscopic technique. The formation and the microstructure of the Ba2Co2Fe12O22 was studied as a function of heat treatment temperature and it was observed that well defined hexagonal plate-like fine particles with particle sizes between 130 and 400 nm were formed at relatively lower temperature (900 °C) as compared to conventional solid state reaction method (1100 °C). Magnetic properties of the samples were also studied as a function of heat treatment temperature and it showed large saturation magnetization (Ms) ranging from 30.9 to 47.6 emu/g and a wide range of coercivity (130∼1566 Oe) depending on the heat treatment temperature. The very high saturation magnetization at relatively lower temperature (say 800 °C) arises due to the presence of several high magnetic impurities, such as BaFe12O19 and CoFe2O4. The saturation magnetization increases with increasing heat treatment temperature above 900 °C, while the coercivity showed a reversed order.

Original languageEnglish
Pages (from-to)2718-2722
Number of pages5
JournalMaterials Letters
Volume60
Issue number21-22
DOIs
Publication statusPublished - Sep 1 2006

Keywords

  • Hexagonal ferrite
  • Magnetic properties
  • Sol-gel synthesis
  • X-ray diffraction

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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