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We investigate the temperature dependence of the dielectric constant of BaTiO3 ceramic with coarse to nanograin size under different hydrostatic high pressures up to 5000 bar in the range between room temperature and 200℃. The ferroelectric-to-paraelectric phase transition temperatures Tc are determined from the peak of dielectric constant versus temperature. The values of average grain-size are estimated from the SEM images. It is found that the magnitude of dTc/dp varies considerably from sample to sample depending on grain size. The Curie point Tc of the sample with small grain size decreases more sharply than that of samples with larger one. 相似文献
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电磁波带隙材料的低温共烧陶瓷技术制备及性能 总被引:1,自引:1,他引:0
根据共面紧凑型光子晶体的原理和HFSS仿真结果设计了禁带位于超宽带(UWB,3.1~10.6 GHz)范围的EBG(电磁波带隙)结构,然后采用低温共烧陶瓷(LTCC)工艺制备出了设计的EBG结构。利用光学显微镜和扫描电子显微镜观察了所制EBG结构的微观结构,结果显示烧结体中陶瓷与银电极结合良好。另外,经HP8720ES矢量网络分析仪测试发现其电磁波禁带位于4.0~5.5 GHz,深度大于20 dB。 相似文献
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