Simple process synthesis of BaTiO3-(Ni,Zn,Cu)Fe2O4 ceramic composite

被引:7
|
作者
Kamishima, Kenji [1 ]
Nagashima, Yoshitaka [1 ]
Kakizaki, Koichi [1 ]
Hiratsuka, Nobuyuki [1 ]
Watanabe, Kowashi [2 ]
Mise, Takaya [2 ]
Naganuma, Hiroshi [3 ]
Okamura, Soichiro [3 ]
机构
[1] Saitama Univ, Grad Sch Sci & Engn, Saitama 3388570, Japan
[2] RIKEN, Wako, Saitama 3510198, Japan
[3] Tokyo Univ Sci, Dept Appl Phys, Shinjuku Ku, Tokyo 1628601, Japan
关键词
growth from solid phases; multiphase diffusion; solid-solid phase transformations; powder processing; ferroelectric-ferromagnetic composite; EPMA mapping; spinel ferrite; barium titanate;
D O I
10.1143/JPSJ.77.064801
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Ceramic composites (2Ni(0.41)Zn(0.41)Cu(0.18)Fe(2)O(4)-BaTiO3) were successfully prepared by a direct solid-state reaction of raw materials (BaCO3, CuO, alpha-Fe2O3, NiO, TiO2, 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 BaTiO3 phases. The composites are so homogeneous that the ferrite and BaTiO3 grains do not react with each other and have radii in the range of 1-5 mu m. Hexagonal BaTiO3 (h-BaTiO3) can be made in this composite form with a sintering temperature of 1200 degrees C, although h-BaTiO3 can be usually synthesized above 1460 degrees C. The freezing-point depression of BaTiO3 takes place due to the mixing with the spinel ferrite, which may result in the formation of h-BaTiO3 at a low temperature of 1200 degrees C.
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页数:4
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