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J. Korean Ceram. Soc. > Volume 61(1); 2024 > Article
Journal of the Korean Ceramic Society 2024;61(1): 91-96.
doi: https://doi.org/10.1007/s43207-023-00326-0
Enhancement of thermal-electrical like response by flexoelectric effect in sodium bismuth titanate bilayer ceramics with compositional inhomogeneity
Rui Xu1, Baoju Xia1, Dae-Yong Jeong2, Baojin Chu1
1CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, State Key Laboratory of Advanced Materials and Electronic Components, University of Science and Technology of China, Hefei, 230026, China
2Department of Materials Science & Engineering, Inha University, Incheon, 22212, Korea
Correspondence  Dae-Yong Jeong ,Email: dyjeong@inha.ac.kr
Baojin Chu ,Email: chubj@ustc.edu.cn
Received: June 15, 2023; Revised: August 17, 2023   Accepted: August 25, 2023.  Published online: November 28, 2023.
ABSTRACT
Owing to the difference in the thermal expansion coefficients of the ceramics with different compositions, ceramics with a compositional gradient generate the macroscopic strain gradient during sintering process, which may generate a macroscopic internal electric potential by the flexoelectric effect. Here we show that the bilayer Na0.5Bi0.5TiO3-based ceramics with high electrical conductivity exhibits a thermal-electrical like response, which are larger than that of the single-layer ceramics. We propose that if the surfaces and the interface layer of the bilayer ceramics are inhomogeneously deformed under the influence of the temperature and compositional gradient, the bilayer ceramics can generate the flexoelectric-like response. The coupling of conductivity with this response results in the thermal-electrical like response.
Key words: Ferroelectric ceramics · Compositional gradient · Flexoelectric effect · Thermal-electrical like response
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