Giant Electrocaloric Response Over A Broad Temperature Range in Modified BaTiO3 Ceramics

作者：Xiaoshi Qian, Hui‐Jian Ye, Yingtang Zhang, Haiming Gu, Xinyu Li, Clive A. Randall, Qiming Zhang · 发表于：Advanced Functional Materials · 年份：2013 · DOI：10.1002/adfm.201302386 · 被引用次数：470 · 研究领域：Ferroelectric and Piezoelectric Materials、Multiferroics and related materials、Dielectric materials and actuators

A giant electrocaloric effect (ECE) near room temperature is reported in a lead‐free bulk inorganic material. By tuning Ba(ZrxTi1–x)O3 compositions which also exhibit relaxor ferroelectric response to near the invariant critical point, the Ba(ZrxTi1–x)O3 bulk ceramics at x ∼ 0.2 exhibit a large adiabatic temperature drop of 4.5 K, a large isothermal entropy change of 8 J kg−1 K−1, and a large EC coefficient (|ΔTc/ΔE| = 0.52 × 10−6 KmV−1 and ΔS/ΔE = 0.93 × 10−6 J m kg−1 K−1 V−1) over a 30 K temperature range. These properties added together indicate a general solution of the electrocaloric materials with high performance for practical cooling applications.