Large electrocaloric responses in [Bi1/2(Na,K)1/2]TiO3‐based ceramics with giant electro‐strains
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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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This is the peer-reviewed version of the following article: Fan, Zhongming, Xiaoming Liu, and Xiaoli Tan. "Large electrocaloric responses in [Bi1/2 (Na, K) 1/2] TiO3‐based ceramics with giant electro‐strains." Journal of the American Ceramic Society 100, no. 5 (2017): 2088-2097, which has been published in final form at DOI: 10.1111/jace.14777. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.