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Large Electrocaloric Effect in Lead-free Ba(HfxTi1–x)O3 Ferroelectric Ceramics for Clean Energy Applications

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journal contribution
posted on 15.05.2018, 00:00 by Ming-Ding Li, Xin-Gui Tang, Si-Ming Zeng, Qiu-Xiang Liu, Yan-Ping Jiang, Tian-Fu Zhang, Wen-Hua Li
Ba­(HfxTi1–x)­O3 ferroelectric ceramics were prepared by a conventional solid-state reaction process, and the correlation of structure, dielectric, ferroelectric, and electrocaloric properties were studied. The consequences indicated that the TC of Ba­(HfxTi1–x)­O3 ceramics decreased, while TT–O and TO–R increased with the increase of hafnium content. Large electrocaloric effect values of 1.64 K (117 °C) and 1.21 K (76 °C) were observed for Ba­(HfxTi1–x)­O3 with x = 0.05 compositions. And, corresponding electrocaloric coefficients respectively were 0.33 and 0.24 K·mm·kV–1. In addition, compared with the second-order phase transition region, larger electrocaloric coefficients (ΔTf /ΔE ≥ 0.19 K·mm·kV–1) were obtained in the first-order phase transition region for all compositions. Meanwhile, the maximum values of electrocaloric coefficients ΔTf /ΔE = 0.38 K·mm·kV–1 was achieved in a smaller electric field for Ba (HfxTi1–x)­O3 with x = 0.03 compositions.