Large electrocaloric responses in [Bi1/2(Na,K)1/2]TiO3‐based ceramics with giant electro‐strains |
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| Authors: | Zhongming Fan Xiaoming Liu Xiaoli Tan |
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| Affiliation: | 1. Department of Materials Science and Engineering, Iowa State University, Ames, Iowa;2. Department of Materials Science and Engineering, Iowa State University, Ames, IowaMember, The American Ceramic Society. |
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| Abstract: | The electrocaloric effect (ECE) is investigated through indirect measurement in two lead‐free Bi1/2(Na,K)1/2]TiO3‐based ceramics that were previously reported to display giant electro‐strains. In the Nb‐doped ceramic, denoted as BNKT‐2.5Nb, a decent temperature change of ΔT=1.85 K and an electrocaloric responsivity of ΔT/ΔE=0.37 (10?6Km V?1) are found around room temperature (32°C). While in the Ta‐doped ceramic, BNKT‐1.5Ta, a wide operation temperature range (Tspan ~55 K) is observed near room temperature. Additional electrical measurements, as well as transmission electron microscopy experiments, are performed to identify the mechanisms of the ECE in both ceramics. |
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| Keywords: | [Bi1/2(Na K)1/2]TiO3‐based ceramics electrocaloric effect ergodic relaxor |
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