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Enhanced electrocaloric performance within wide temperature span in Al-doped BaZr0.2Ti0.8O3 ceramics

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Abstract

Al-doped BaZr0.2Ti0.8O3 (BZT20) ceramics were prepared by solid-state sintering, and the relaxation degree of phase transition was tailored effectively. The microstructure, dielectric properties, ferroelectric properties, and electrocaloric (EC) performance of Al2O3-doped BZT20 ceramics were studied, respectively. The results show that Al2O3 doping induces changes in Curie temperature and dielectric properties. When the additive amount of Al2O3 is 1.25 at.%, the Curie temperature drops to around room temperature (RT), and the dielectric loss is lower than that of pure BZT20 ceramics. The diffusion constant γ reaches a minimum value of 1.57 when the Al2O3 content is 1.25 at.%, indicating that a relatively large latent heat would be gathered while there is a phase transition. As a result, an enhanced EC response of ∆Tmax = 0.293 K near RT is obtained when the Al2O3 content is 1.25 at.%, which is 1.6 times that of pure BZT20. It is also impressive that a wide working temperature range can be obtained, that is, Tspan = 73 K for BZT20 ceramics with 1 at.% of Al3+ ionic content.

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Data availability

The data used to support the findings of this study are available from the corresponding author upon request.

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Funding

The authors acknowledge the financial supports from the National Natural Science Foundation of China (Grant Nos. 52272131, 51602345), the Natural Science Foundation of Jiangsu Province (Grant No. BK20210137), Yue Qi Young Scholar Project of China University of Mining & Technology (Beijing) (Grant No. 2019QN12), the State Key Laboratory of New Ceramics and Fine Processing Tsinghua University (Grant Nos. KFZD201901, KF201910), and Open Fund of State Key Laboratory of Coal Resources and Safe Mining (Grant No. SKLCRSM19KFA13).

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Authors and Affiliations

  1. Department of Materials Science and Engineering, China University of Mining & Technology, Beijing, 100083, China

    Li-Qian Cheng, Guozheng Jiang, Zhenhua Ma, Minghao Yu & Jingtong Lu

  2. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China

    Ze Xu

  3. QingTao (Kunshan) Energy Development Co., Ltd., Suzhou, 215334, China

    Kai Chen

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  1. Li-Qian Cheng
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  2. Guozheng Jiang
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  3. Zhenhua Ma
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  4. Ze Xu
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  5. Minghao Yu
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  6. Jingtong Lu
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  7. Kai Chen
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Contributions

LC contributed to investigation, methodology, and writing of the original draft. GJ contributed to synthesis, performance measurement, and writing of the original draft. ZM contributed to performance measurement and theory analysis. ZX contributed to performance measurement. MY contributed to performance measurement and theory analysis. JL contributed to performance measurement. KC contributed to methodology.

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Correspondence to Li-Qian Cheng.

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Cheng, LQ., Jiang, G., Ma, Z. et al. Enhanced electrocaloric performance within wide temperature span in Al-doped BaZr0.2Ti0.8O3 ceramics. J Mater Sci: Mater Electron 33, 24986–24994 (2022). https://doi.org/10.1007/s10854-022-09207-4

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