Citation

Tan, P. Y. and Tan, K. B. and Khaw, C. C. and Murthy, H. C. Ananda and Balachandran, R. and Chen, S. K. and Lee, O. J. and Chan, Kah Yoong and Lu, M. (2024) Electrical circuit modeling for the relaxor response of bismuth magnesium tantalate pyrochlore. Journal of Science: Advanced Materials and Devices, 9 (2). p. 100715. ISSN 2468-2179

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Abstract

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.

Item Type:	Article
Uncontrolled Keywords:	Pyrochlore, Ac impedance, Relaxor, Dielectric, Equivalent circuit
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7800-8360 Electronics > TK7871 Electronics--Materials
Divisions:	Faculty of Engineering (FOE)
Depositing User:	Ms Nurul Iqtiani Ahmad
Date Deposited:	02 May 2024 02:46
Last Modified:	02 May 2024 02:46
URII:	http://shdl.mmu.edu.my/id/eprint/12388

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