采用溶胶-凝胶结合二次煅烧的方法制备了高介电常数BaTiO3陶瓷,通过X射线衍射分析得到所制备的体系为四方相和立方相共存结构,从扫描电镜的图像中能观察其晶粒尺寸为1μm。通过TF2000铁电分析仪得到其介电常数在煅烧温度为1310℃,保温时间为4h,室温、测试频率为100Hz、测试电压为100V的条件下最大值为38306。研究了BaTiO3铁电陶瓷的反转电流随温度、频率和电压的影响规律,研究发现随着温度的升高反转电流缓慢降低,而随着电场和频率的增加反转电流迅速升高。从能量的观点也能进一步分析温度和电场对于反转电流的影响。
The BaTiO3 ceramics with high dielectric constant were prepared by sol-gel combing twice-sintering technique.The system was indicated the coexist of tetragonal and cubic phases from the X-ray diffraction pattern and crystal partial size is 1μm from the scanning electron microscope pattern,the maximum dielectric constant reached 38306 with TF2000 analyzer under testing conditions of room temperature and small signal frequence 100Hz.The effects of temperature,frequency and applied electric field on switching current of BaTiO3 ferroelectric ceramic were studied in the paper,it is found that the domain switching current slowly decreases with increasing temperature and sharply increases with increasing frequency and applied electric field.The results obtained also can be interpreted by the factors of the temperature and electric field from the viewpoint of energy analysis.
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