Simple Process Synthesis of BaTiO_3-(Ni,Zn,Cu)Fe_2O_4 Ceramic Composite(Cross-disciplinary physics and related areas of science and technology)
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概要
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Ceramic composites (2Ni_<0.41>Zn_<0.41>Cu_<0.18>Fe_2O_4-BaTiO_3) were successfully prepared by a direct solid-state reaction of raw materials (BaCO_3, CuO, α-Fe_2O_3, NiO, TiO_2, and ZnO). X-ray diffraction (XRD) and electron probe micro analysis (EPMA) measurements were performed for these samples and it is confirmed that the composites consist of spinel ferrite and BaTiO_3 phases. The composites are so homogeneous that the ferrite and BaTiO_3 grains do not react with each other and have radii in the range of 1-5μm. Hexagonal BaTiO_3 (h-BaTiO_3) can be made in this composite form with a sintering temperature of 1200℃, although h-BaTiO_3 can be usually synthesized above 1460℃. The freezing-point depression of BaTiO_3 takes place due to the mixing with the spinel ferrite, which may result in the formation of h-BaTiO_3 at a low temperature of 1200℃.
- 社団法人日本物理学会の論文
- 2008-06-15
著者
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NAGANUMA Hiroshi
Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University
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KAMISHIMA Kenji
Graduate School of Science and Engineering, Saitama University
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NAGASHIMA Yoshitaka
Graduate School of Science and Engineering, Saitama University
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KAKIZAKI Koichi
Graduate School of Science and Engineering, Saitama University
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HIRATSUKA Nobuyuki
Graduate School of Science and Engineering, Saitama University
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WATANABE Kowashi
RIKEN (The Institute of Physical and Chemical Research)
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MISE Takaya
RIKEN (The Institute of Physical and Chemical Research)
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OKAMURA Soichiro
Department of Applied Physics, Tokyo University of Science
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Hiratsuka Nobuyuki
Graduate School Of Science And Engineering Saitama University
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Okamura Soichiro
Dep. Of Applied Physics Fac. Of Sci. Tokyo Univ. Of Sci.
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Okamura Soichiro
Department Of Applied Physics Tokyo University Of Science
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Okamura Soichiro
Department Of Applied Physics Faculty Of Science Science University Of Tokyo
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Naganuma Hiroshi
Department Of Applied Physics Tokyo University Of Science
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Naganuma Hiroshi
Department Of Applied Physics Faculty Of Science Tokyo University Of Science
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Kakizaki Koichi
Graduate School Of Science And Engineering Saitama University
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Nagashima Yoshitaka
Graduate School Of Science And Engineering Saitama University
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Kamishima Kenji
Graduate School Of Science And Engineering Saitama University
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