Abstract
Ba ferrite materials with porous microstructures were prepared from a natural cedar wood template in order to investigate new electromagnetic shielding materials. The wood templates were infiltrated with barium nitrate and iron nitrate solutions (molar ratio = 1:12) and dried to form ferrite gel, then, they were sintered in air at a temperature between 800 °C and 1400 °C. The 1-dimensional porous structures were retained after sintering and the pore size was approximately 10–20 μm. These ferrites show large coercive force and anisotropy field. The largest coercive force was obtained for the specimen sintered at 800 °C.
Highlights
Porous ceramics have been attractive materials for various applications such as thermal and sound absorption, filtration, catalysts, etc
We had developed a unique preparation technique for porous ceramics where the porous structures of the ceramics were copied from a natural wood template by a bio-casting method [2,3,4]
We report the preparation of a porous Ba-ferrite BaFe12O19 from a wood template by the bio-casting method and its magnetic properties
Summary
Porous ceramics have been attractive materials for various applications such as thermal and sound absorption, filtration, catalysts, etc. Snoek’s limit and the permeability is kept high in the GHz frequency range [6]. This presents a possibility that the microstructure gives an increase of the permeability of ferrite materials in the GHz frequency region. We are expecting that thin film-like magnetic properties of the porous ferrite increase the permeability in the high frequency region. The hexagonal Ba-ferrite is a hard magnetic material with large magnetic anisotropy energy and is recently expected to be a new electromagnetic absorber by utilizing magnetic resonance because the resonance frequency with hard Ba-ferrite lies in GHz frequency region due to its large magnetic anisotropy. We report the preparation of a porous Ba-ferrite BaFe12O19 from a wood template by the bio-casting method and its magnetic properties
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