反铁电性
材料科学
铁电性
电热效应
相变
拉曼光谱
陶瓷
电介质
铁电陶瓷
相(物质)
凝聚态物理
光电子学
复合材料
化学
光学
物理
有机化学
作者
Mengjiao Yu,D. Wu,Changshun Dai,Mingsheng Long,Lei Shan,Chunchang Wang,Feng Li
摘要
Antiferroelectric–ferroelectric phase transition in antiferroelectric (AFE) materials usually triggers high-performance electrocaloric effect (ECE), as represented by PbZrO3-based AFE. As an isostructure to PbZrO3, EC research in PbHfO3-based AFE ceramics are significantly left out. In this work, temperature dependent electrocaloric performances in Pb0.97La0.02(Hf0.92Ti0.08)O3 with typical AFE features are explored, and rhombohedral ferroelectric (FER), AFE1 (A1, Pbam), and AFE2 (A2, Imma) triple phases are induced as temperature increases. This leads to dual coexisting regions with FER-to-A1 and A1-to-A2 at a temperature of ∼20 °C and ∼100 °C, respectively, where local EC maxima are produced with an ΔT ∼0.06 K and ΔT ∼0.16 K (E = 70 kV/cm). These are certified by comprehensive characterizations of in situ x-ray diffractometer, AFE electrical properties, and Raman spectra analysis. This strongly indicates that AFE (Pbam)-to-AFE (Imma) phase transition could efficiently optimize ECE in PbHfO3-based AFE, in addition to the conventional understandings of FE–paraelectric and AFE–paraelectric modulation strategy. This work not only presents the potential of PbHfO3-based AFE in solid-state cooling applications but also serves as a catalyst for further seeking for high-EC AFE materials.
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