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Fabrication and characterization of Ni0.3Zn0.7Fe2.0O4-BaTiO3 ceramic composites

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Title: Fabrication and characterization of Ni0.3Zn0.7Fe2.0O4-BaTiO3 ceramic composites
Authors: ABE, Kazutomo Browse this author
KITAHARA, Naoto Browse this author
HIGUCHI, Mikio Browse this author →KAKEN DB
TAKAHASHI, Junichi Browse this author
Keywords: Ni0.3Zn0.7Fe2.0O4-BaTiO3 composite
Solid state reaction
Ti-doped NiZn ferrite
Dielectric permittivity
Electromagnetic wave absorber
Issue Date: 1-Sep-2009
Publisher: Ceramic Society of Japan
Journal Title: Journal of the Ceramic Society of Japan
Volume: 117
Issue: 1369
Start Page: 944
End Page: 949
Publisher DOI: 10.2109/jcersj2.117.944
Abstract: The ceramic composites containing 1-25 vol% BaTiO3 in a ferrite matrix phase of Ni0.3Zn0.7Fe2O4 were fabricated by sintering at 1250°C in air. The sintered composites indicated a steep increase in dielectric permittivity in a small BaTiO3 ratio up to 5 vol%. In a limited BaTiO3 ratio of 3-15 vol%, a reaction between Ni0.3Zn0.7Fe2O4 and BaTiO3 resulted in the production of a liquid phase during sintering, which caused correspondingly the formation of secondary phases of BaFe2O4 ss and hexagonal BaTiO3 ss. These solid phase and microstructure changes, however, brought about little contribution to the increasing permittivity of the composites. Electrical property evaluations combined with compositional analysis revealed that the remarkably increasing permittivity could be predominantly attributed to the electron hopping between Fe2+ and Fe3+ in the ferrite matrix, which was caused by the incorporation of a small amount of Ti4+ into the spinel sublattice.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 樋口 幹雄

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