烧结温度对Ba0.96Ca0.04Ti2O5陶瓷的物相结构与电学性能影响探究

The Investigation of Effect of Sintering Temperature on Phase Structure and Electrical Properties of Ba0.96Ca0.04Ti2O5 Ceramics

  • 摘要: 在改性Pechini法制备Ba0.96Ca0.04Ti2O5(BCT2)粉体的基础上,采用常压固相烧结工艺制备了BCT2陶瓷,详细探究了在不同烧结温度(1050~1250 ℃)下对BCT2陶瓷物相结构与性能的影响规律。采用X射线衍射仪、冷场发射扫描电子显微镜、电子比重天平和精密阻抗分析仪,分别测试了BCT2陶瓷的物相结构、断面形貌、致密化程度和电学性能。结果表明,随着烧结温度一定程度的升高,BCT2陶瓷的结晶度提升、致密化程度增加、介电性能和铁电性增强。最佳烧结温度(1200 ℃)下BCT2陶瓷的性能为ρr=96.64%、TC=444.9 ℃、εm=619.3和γ=0.429。

     

    Abstract: Ba0.96Ca0.04Ti2O5 (BCT2) ceramics are synthesized by solid state sintering method with as-prepared BCT2 powders that is prepared via modified Pechini method. Effect of different sintering temperature (1050~1250 ℃) on phase structure and electrical properties of the BCT2 ceramics are fully investigated. The phase structure, fractured morphology, densification, and electrical properties of the BCT2 ceramics are tested by X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), electron specific gravity balance and precision impedance analyzer, respectively. The results show that the crystallinity, densification, dielectric and ferroelectric properties of BCT2 ceramics are elevated with a certain increment of the sintering temperature. The optimum properties, i.e., ρr=96.64%, TC=444.9 ℃, εm=619.3, and γ=0.429 of the BCT2 ceramics are obtained at a best sintering temperature of 1200 ℃.

     

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