Dielectric Spectra of BaTiO3-Based Materials Measured by Impedance Analyzers up to 1 GHz
Dielectric Spectra of BaTiO3-Based Materials Measured by Impedance Analyzers up to 1 GHz
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使用高达 1 GHz 的阻抗分析仪测量 BaTiO3 基材料的介电谱
DOI：
10.1143/jjap.42.6143
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发表时间：
2003
影响因子：
1.5
通讯作者：
T. Tsurumi
中科院分区：
文献类型：
--
作者：
H. Kakemoto;Jianyong Li;S. Nam;S. Wada;T. Tsurumi
针对高介电常数、高介电损耗材料的介电常数测量问题，提出了一种利用阻抗分析仪测量集总阻抗的新方法。用于测量的样品为BaTiO 3、（Ba 0.6，Sr 0.4）TiO 3和Ba（Zr 0.25，Ti 0.75）O 3陶瓷。从原始阻抗数据计算的介电常数与频率的曲线，这是由于样品的自感在数百MHz处观察到的谐振峰。根据反射系数与电长度校准值的关系曲线，确定了自感系数对应的电长度。由与测量电路中的电容对应的电长度确定样品的电容。该电长度可由自感电长度和四分之一波长谐振时的电长度求得。在这项研究中提出的程序，成功地消除了共振峰。Ba（Zr 0. 25，Ti 0. 75）O3的介电常数-频率曲线在100 MHz以上表现出宽的介电弛豫，而（Ba 0. 6，Sr 0. 4）TiO 3的介电弛豫在1 GHz以下表现出几乎平坦的介电弛豫。
A new analysis procedure was proposed to determine the dielectric permittivity of materials with relatively high permittivity and high dielectric loss by a lumped impedance measurement using impedance analyzers. The samples used for the measurement were BaTiO3, (Ba0.6,Sr0.4)TiO3 and Ba(Zr0.25,Ti0.75)O3 ceramics. Resonance peaks were observed at hundreds MHz in the permittivity vs frequency curves calculated from raw impedance data, which was due to the self-inductance of the samples. The electric length corresponding to the self-inductance was determined from the curves of the reflection coefficient vs the calibration value of the electric length measured for a brass disc with the sample dimension. The capacitance of the samples was determined from the electric length corresponding to the capacitance in the measuring circuit. This electric length could be obtained from the electric length corresponding to the self-inductance and that at the quarter-wave resonance. The resonance peaks were successfully eliminated by the procedure proposed in this study. The permittivity vs frequency curve of Ba(Zr0.25,Ti0.75)O3 showed a broad dielectric relaxation above 100 MHz, while that of (Ba0.6,Sr0.4)TiO3 showed an almost flat dielectric relaxation up to 1 GHz.