Abstract
(Ba1 − xBi0.5xSr0.5x)(Ti1 − xBi0.5xZr0.5x)O3 [BBSTBZ, 0.02 ≤ x ≤ 0.1] ceramics were synthesized by a traditional solid-state reaction technique. The transition from tetragonal phase to pseudocubic phase at 0.06 ≤ x ≤ 0.08 was observed in Raman spectra and X-ray diffraction patterns. With adding (Bi3+, Sr2+, Zr4+), the thermal-stability of relative permittivity (Δε/ε25 °C) and dielectric loss (tan δ) of ceramics were optimized. Especially, (Ba0.9Bi0.05Sr0.05)(Ti0.9Bi0.05Zr0.05)O3 ceramics with small Δε/ε25 °C value (≤ ± 15%) in a wide temperature range of − 70 °C to 155 °C, high εr (εr ~ 2088–2116) and tan δ (tan δ ≤ 0.02) from − 10 °C to 200 °C were obtained, which indicates that BBSTBZ is suitable for X8R applications. Impedance spectroscopy was used to analyse the conduction and relaxation processes. The results showed that the relaxation and conduction process in the high-temperature region are thermally activated, and the oxygen vacancies are charge carriers.
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Acknowledgements
This study was supported by Natural Science Foundation of China (Nos. 11464009 and 11664008), Natural Science Foundation of Guangxi (Nos. 2015GXNSFDA139033, 2017GXNSFFA198011 and 2017GXNSFDA198027) and Research Start-up Funds Doctor of Guilin University of Technology (No. GUTQDJJ2017133).
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Li, X., Chen, X., Yan, X. et al. Excellent thermal stability and low dielectric loss of (Ba1 − xBi0.5xSr0.5x)(Ti1 − xBi0.5xZr0.5x)O3 solid solution ceramics in a broad temperature range applied in X8R. Appl. Phys. A 124, 771 (2018). https://doi.org/10.1007/s00339-018-2194-0
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DOI: https://doi.org/10.1007/s00339-018-2194-0