Giant Electrocaloric Response Over A Broad Temperature Range in Modifi ed BaTiO 3 Ceramics
Giant Electrocaloric Response Over A Broad Temperature Range in Modifi ed BaTiO 3 Ceramics
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DOI：
10.1002/adfm.201302386
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发表时间：
2014-03-01
影响因子：
19
通讯作者：
Zhang, Q. M.
中科院分区：
文献类型：
--
作者：
Qian, Xiao-Shi;Ye, Hui-Jian;Zhang, Q. M.
据报道，无铅块状无机材料在室温附近具有巨大的电热效应（ECE）。通过调整Ba（ZrxTi 1-x）O-3的成分，使其在恒定临界点附近也表现出弛豫铁电响应，在x接近0.2时，Ba（ZrxTi 1-x）O-3块体陶瓷表现出4.5 K的大绝热温降，8 J kg（-1）K-1的大等温熵变和大EC系数（|T-c/E| = 0.52 x 10（-6）KmV（-1）和S/E = 0.93 x 10（-6）J m kg（-1）K-1 V-1）。这些性质加在一起表明具有高性能的电热材料用于实际冷却应用的一般解决方案。
A giant electrocaloric effect (ECE) near room temperature is reported in a lead-free bulk inorganic material. By tuning Ba(ZrxTi1-x)O-3 compositions which also exhibit relaxor ferroelectric response to near the invariant critical point, the Ba(ZrxTi1-x)O-3 bulk ceramics at x approximate to 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 (|T-c/E| = 0.52 x 10(-6) KmV(-1) and S/E = 0.93 x 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.