Dr. Xiaohua Huang Profile

Dr. Xiaohua Huang

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Proceedings Article | 1 February 2024 Paper

Study on the dielectric and impedance behavior of (1-x) K0.5Na0.5NbO3-xBi(Ni0.5Zr0.5)O3 ceramics with 0 ≤ x ≤ 0.2

Zhexian Zheng, Xiaohua Huang, Wenhao Xun

Proceedings Volume 13068, 130680A (2024) https://doi.org/10.1117/12.3016399

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The (1-x)K_0.5Na_0.5NbO₃-xBi(Ni_0.5Zr_0.5)O₃[(1-x)KNN-xBNZ] ceramics with 0 ≤ x ≤0.2 were prepared by the solid-state method. The (1-x)KNN-xBNZ samples with 0.05 ≤ x ≤ 0.2 formed solid solutions with a stable perovskite structure and exhibited a cubic phase at room temperature. The sample with x=0.2 shown outstanding thermal robustness within the range of -35°C to 260°C, suggesting substantial promise for utilization in high-temperature multilayer ceramic capacitors. A systematic study of impedance spectra and modulus spectra plotted in various forms indicates the dominant grain effect in the single non-Debye thermally activated relaxation process for the BNZ-doped samples except the composition with x = 0.1. The grain and grain boundary effects may make the contribution to the relaxation process of the composition with x = 0.1. The frequency-related normalized impedance spectra and the calculated activation energy suggest that the conductive behavior and the relaxation process within the system of (1-x)KNN-xBNZ may be associated with the short-range movement of doubly ionized oxygen vacancies.

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