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Research Article | Open Access

Structure and enhanced dielectric temperature stability of BaTiO3-based ceramics by Ca ion B site-doping

Xuewen Jianga,b, Hua Haoa,b( ), Yang Yangb, Enhao Zhoub, Shujun Zhangd, Ping Weie, Minghe Caob, Zhonghua Yaoa,b, Hanxing Liuc
Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory, Xianhu Hydrogen Valley, Foshan, 528200, China
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Material Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China
Institute for Superconducting and Electronic Materials, Australian Institute of Innovative Materials, University of Wollongong, Wollongong, NSW, 2500, Australia
Nanostructure Research Centre, Wuhan University of Technology, Wuhan, 430070, China

Peer review under responsibility of The Chinese Ceramic Society.

Show Author Information

Highlights

• The Ca ion substituting Ti ion was confirmed in BaTi1-xCaxO3-x [BTC100×] (0 ≤ x ≤ 0.05) ceramic system.

• The low temperature stability of dieletric constant was improved with the Ca ion substituting Ti ion.

• The dielectric-temperature stability was improved further with the addition of Bi(Zn0.5Ti0.5)O3 (BZT) into BTC4.

• The dielectric temperature stability of 0.85BTC4-0.15BZT ceramics met the requirement of X9R capacitor specification.

Graphical Abstract

Abstract

Capacitor is an important part of many electronic devices, so the temperature stability as one key parameter of capacitor needs to be improved constantly for meeting the requirements of various application temperature. Here, combined with the X-ray diffraction (XRD), selected area electron diffraction (SAED) and Vienna Ab-initio Simulation Package (VASP) calculation, it was confirmed that Ca ion can substitute the Ti site in the BaTi1-xCaxO3-x [BTC100×] (0 ≤ x ≤ 0.05) ceramics synthesized by solid-phase method which greatly improved the low-temperature stability of dielectric constant. Moreover, introducing Bi3+ and Zn2+ into BTC4 to form (1-y)BaTi0·96Ca0·04O2.96-yBi(Zn0·5Ti0.5)O3 [(1-y)BTC4-yBZT] (0.1 ≤ y ≤ 0.2) ceramics can further improve the dielectric-temperature stability by means of diffused phase transition and core-shell structure. Most importantly, the 0.85BTC4-0.15BZT ceramics with a pseudocubic perovskite structure possessed a temperature coefficient of capacitance at 25 ℃ (TCC25 ℃) being less than ±15% over a wide temperature range of −55 ℃–200 ℃ and a temperate dielectric constant (ε = 1060) and low dielectric loss (tanδ = 1.5%), which measure up to the higher standard in the current capacitor industry such as X9R requirements.

Keywords

BaTiO3Ca substitutedX9R capacitorsDielectric properties

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Journal of Materiomics
Volume 7 Issue 2,
March 2021
Pages 295-301
DOI: 10.1016/j.jmat.2020.09.001
Cite this article:
Jiang X, Hao H, Yang Y, et al. Structure and enhanced dielectric temperature stability of BaTiO3-based ceramics by Ca ion B site-doping. Journal of Materiomics, 2021, 7(2): 295-301. https://doi.org/10.1016/j.jmat.2020.09.001

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Received: 29 July 2020
Revised: 24 August 2020
Accepted: 04 September 2020
Published: 09 September 2020
© 2020 The Chinese Ceramic Society.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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