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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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 2006

Fingerprint

Sol-gel process
Magnetic properties
heat treatment
Heat treatment
gels
magnetic properties
microstructure
Microstructure
Saturation magnetization
saturation
magnetization
coercivity
Coercive force
Temperature
temperature
ferrites
aqueous solutions
salts
solid state
Solid state reactions

Keywords

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

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

The effect of heat treatment temperature on the microstructure and magnetic properties of Ba2Co2Fe12O22 (Co2Y) prepared by sol-gel method. / Chand Pramanik, Nimai; Fujii, Tatsuo; Nakanishi, Makoto; Takada, Jun; Seok, Sang II.

In: Materials Letters, Vol. 60, No. 21-22, 09.2006, p. 2718-2722.

Research output: Contribution to journalArticle

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