Enhanced dielectric relaxation behavior of Zr doped Ba0.9Ca0.1Zr x Ti1−x O3–0.03Bi3+ ceramics
The enhancement of dielectric relaxation behavior of lead-free Zr4+ doped Ba0.9Ca0.1Zr x Ti1−x O3–0.03Bi3+ ceramics prepared by hydrothermal method were studied. The XRD patterns and calculated lattice parameters both indicated a phase transition from tetragonal to cubic phase with x increasing from 0.00 to 0.12. And the increasing Zr exhibits the homogenization of grain size from SEM patterns. Compositions of x = 0.00 and 0.03 were normal ferroelectrics with sharp T m peak while the samples exhibit strong relaxation behavior at x = 0.09 and 0.12 and the relaxation parameters were calculated. Thus the lead-free Ba1−x Ca x Ti1−x Zr x O3 system relaxor ferroelectrics were obtained. The P–E loops of all these samples can be divided into two types: the broad and the narrow, which was probably attributed to the grain size and phase transition at room temperature.
KeywordsDielectric Permittivity Ferroelectric Property Relaxation Behavior ZrOCl2 Homogenization Effect
This research was supported by the National Natural Science Foundation of China (51372144 and 51102159), the New Century Excellent Talents Program of Chinese Education Ministry (NCET-11-1042), the International Science and Technology Cooperation Project Funding of Shaanxi Province (2012KW-06), and Graduate Innovation Fund of Shaanxi University of Science and Technology.
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