Dielectric properties and relaxation of Bi0·5Na0·5TiO3-BaNb2O6 lead-free ceramics |
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| Authors: | Chang-Rong Zhou Xin-Yu Liu |
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| Affiliation: | (1) Department of Information Material Science and Engineering, Guilin University of Electronic Technology, Guilin, Guangxi, 541004, China;(2) School of Material Science and Engineering, Central South University, Changsha, Hunan, 410083, China |
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| Abstract: | A new member of lead-free piezoelectric ceramics of the BNT-based group, (1 − x)Bi0·5Na0·5TiO3−x BaNb2O6, was prepared by conventional solid state reaction and its dielectric properties and relaxation was investigated. X-ray diffraction showed that BaNb2O6 diffused into the lattice of Bi0·5Na0·5TiO3 to form a solid solution with perovskite-type structure. A diffuse character was proved by the linear fitting of the modified Curie-Weiss law. The temperature dependence of dielectric constant at different frequencies revealed that the solid solution exhibited relaxor characteristics different from classic relaxor ferroelectrics. The samples with x = 0·002 and 0·006 exhibited obvious relaxor characteristics near the low temperature dielectric abnormal peak, T f, and the samples with x = 0·010 and 0·014 exhibited obvious relaxor characteristics between room temperature and T f. The mechanism of relaxor behaviour was also discussed according to the macro-domain to micro-domain transition theory. |
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| Keywords: | Diffusion phase transitions dielectric properties relaxor characteristics |
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