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 language | English |
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Pages (from-to) | 2718-2722 |
Number of pages | 5 |
Journal | Materials Letters |
Volume | 60 |
Issue number | 21-22 |
DOIs | |
Publication status | Published - Sep 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