| Electrorheological behavior of rare earth-doped barium titanate suspensions |
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| 作者姓名： | YIN Jianbo GUAN Litao ZHAO Xiaopeng |
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| 作者单位： | Institute of Electrorheological Technology, Department of Applied Physics, Northwestern Ploytechnical University, Xi'an 710072, China,Institute of Electrorheological Technology, Department of Applied Physics, Northwestern Ploytechnical University, Xi'an 710072, China,Institute of Electrorheological Technology, Department of Applied Physics, Northwestern Ploytechnical University, Xi'an 710072, China |
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| 基金项目： | Supported by the National Natural Science Foundation of China (Grant No.59832090) and the National Natural Science Foundation of China for Distinguished Young Scholar (Grant No.50025207) |
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| 摘 要： | Doping Y, La, Ce into barium titanate is found to be able to improve its electrorheological (ER) effect in DC electrical field. The yield stress of a typical doped barium titanate/silicone oil suspension is approximately 3.2 -*7〗kPa at 3.5 -*7〗kV/mm, which is 10 times larger than that of pure barium titanate/silicone oil suspensions. The ER effect increases with the decrease of ionic radius of rare earth (RE) dopant when RE concentration remains constant, and the suspensions exhibit a relatively high shear stress when Y, La, Ce mole fractions are 15%, 10%～15%, and 5%, respectively. Dielectric measurements show that the suitable doping with RE element increases dielectric loss of barium titanate and causes very marked dielectric relaxation at low frequency. By measuring X-ray diffraction patterns of doped barium titanate, it is considered that the occurrence of lattice distortion or defects may be responsible for the change of dielectric properties which results in the improvement of ER effect of barium titanate in DC electrical field.
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| 关 键 词： | electrorheological materials barium titanate rare earth dielectric properties |
Electrorheological behavior of rare earth-doped barium titanate suspensions |
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| YIN Jianbo,GUAN Litao,ZHAO Xiaopeng.Electrorheological behavior of rare earth-doped barium titanate suspensions[J].Progress in Natural Science,2002,12(4):278-283. |
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| Authors: | Yin Jianbo GUAN Litao ZHAO Xiaopeng |
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| Institution: | Institute of Electrorheological Technology, Department of Applied Physics, Northwestern Ploytechnical University, Xi'an 710072, China |
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| Abstract: | Doping Y, La, Ce into barium titanate is found to be able to improve its electrorheological (ER) effect in DC electrical field. The yield stress of a typical doped barium titanate/silicone oil suspension is approximately 3.2 -*7〗kPa at 3.5 -*7〗kV/mm, which is 10 times larger than that of pure barium titanate/silicone oil suspensions. The ER effect increases with the decrease of ionic radius of rare earth (RE) dopant when RE concentration remains constant, and the suspensions exhibit a relatively high shear stress when Y, La, Ce mole fractions are 15%, 10%～15%, and 5%, respectively. Dielectric measurements show that the suitable doping with RE element increases dielectric loss of barium titanate and causes very marked dielectric relaxation at low frequency. By measuring X-ray diffraction patterns of doped barium titanate, it is considered that the occurrence of lattice distortion or defects may be responsible for the change of dielectric properties which results in the improvement of ER effect of barium titanate in DC electrical field. |
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| Keywords: | electrorheological materials barium titanate rare earth dielectric properties |
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