P.Y. Tan , K.B. Tan , C.C. Khaw , H.C. Ananda Murthy , R. Balachandran , S.K. Chen , O.J. Lee , K.Y. Chan , M. Lu
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The frequency-independent ε′ data above 154 K at a fixed frequency of 1 MHz can be well fitted with the Curie-Weiss law and the relaxation features of Bi<sub>3.30</sub>Mg<sub>1.88</sub>Ta<sub>2.82</sub>O<sub>13.88</sub> obeyed the Vogel-Fulcher equation. The dielectric properties of Bi<sub>3.30</sub>Mg<sub>1.88</sub>Ta<sub>2.82</sub>O<sub>13.88</sub> relaxor in the low temperature range of 20–320 K could be satisfactorily modeled with different equivalent circuits. 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引用次数: 0
摘要
通过电感-电容-电阻（LCR）和阻抗光谱技术研究了钽酸铋(Bi3.30Mg1.88Ta2.8O13.88，BMT)的电学特性，其温度范围为 10-1073 K，频率范围为 5 Hz-1 MHz。在低于 180 K 时，BMT 烧绿石表现出有趣的弛豫行为，其频率-温度相关介电常数 ε′ 和介电损耗 tan δ 分别表现出高分散特性。在固定频率为 1 MHz 时，154 K 以上与频率无关的ε′数据可以很好地与居里-魏斯定律拟合，Bi3.30Mg1.88Ta2.8O13.88 的弛豫特征服从 Vogel-Fulcher 方程。在 20-320 K 的低温范围内，Bi3.30Mg1.88Ta2.82O13.88 弛豫器的介电性能可以通过不同的等效电路得到令人满意的模型。从这个角度来看，需要一个由并联 R-C-CPE 元件与电容器串联组成的主电路来准确拟合低温数据。
Electrical circuit modeling for the relaxor response of bismuth magnesium tantalate pyrochlore
The electrical properties of bismuth magnesium tantalate pyrochlore, Bi3.30Mg1.88Ta2.82O13.88 (BMT) were investigated by both inductor-capacitor-resistor (LCR) and impedance spectroscopy techniques covering a broad temperature range of 10–1073 K and a frequency range of 5 Hz - 1 MHz. At below ∼180 K, BMT pyrochlore exhibited interesting relaxor behaviour that showed high dispersion characteristics in its frequency-temperature dependent dielectric constants, ε′ and dielectric losses, tan δ, respectively. The maximum ε′max of ∼77 was obtained at the temperature maximum, Tm of 154 K. The frequency-independent ε′ data above 154 K at a fixed frequency of 1 MHz can be well fitted with the Curie-Weiss law and the relaxation features of Bi3.30Mg1.88Ta2.82O13.88 obeyed the Vogel-Fulcher equation. The dielectric properties of Bi3.30Mg1.88Ta2.82O13.88 relaxor in the low temperature range of 20–320 K could be satisfactorily modeled with different equivalent circuits. In this perspective, a master circuit consisting of a parallel R-C-CPE element in series with a capacitor was required to accurately fit the low temperature data.
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