Large Electrocaloric Effect in Lead-free Ba(HfxTi1–x)O3 Ferroelectric Ceramics for Clean Energy Applications
2018
Li, Ming-Ding | Tang, Xin-Gui | Zeng, Si-Ming | Liu, Qiu-Xiang | Jiang, Yan-Ping | Zhang, Tian-Fu | Li, Wenhua
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.
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