Abstract
High-performance temperature range of the morphotropic phase boundary in the 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 series of ceramics is broadened by sintering the green ceramic discs formed from the mixture of pre-sintering (Ba0.7Ca0.3)TiO3 gel and Ba(Zr0.2Ti0.8)O3 gel. The morphotropic phase boundary occurring at room temperature with x = 0.5 is found out in the series of the (1-x)Ba(Zr0.2Ti0.8)O3-x(Ba0.7Ca0.3)TiO3 ceramics sintered at 1250Co by measuring ferroelectric properties and crystal structure. The optimum performance of 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 is obtained by pre-sintering (Ba0.7Ca0.3)TiO3 gel at 300Co, and its high-performance temperature range from −77 to 40Co is about 1.7 times broader than that of the 0.5Ba(Zr0.2Ti0.8)O3-0.5(Ba0.7Ca0.3)TiO3 ceramic sintered directly at 1250Co. It is found that the contents of phase composition in the optimum sample are 63% for morphotropic phase boundary with x = 0.5, 18% for Rhombohedral phase, and 19% for Tetragonal phase. The pre-sintering approach not only maintains the excellent ferroelectric properties induced by the morphotropic phase boundary, but also broadens the applicable high-performance temperature range of the samples.
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