Giant electrocaloric response over a broad temperature range in modified BaTiO3 Ceramics

Xiao Shi Qian, Hui Jian Ye, Ying Tang Zhang, Haiming Gu, Xinyu Li, C. A. Randall, Q. M. Zhang

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Abstract

A giant electrocaloric effect (ECE) near room temperature is reported in a lead-free bulk inorganic material. By tuning Ba(ZrxTi 1-x)O3 compositions which also exhibit relaxor ferroelectric response to near the invariant critical point, the Ba(Zr xTi1-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. A giant electrocaloric effect (ECE), i.e., a large adiabatic temperature drop (ΔTc) with a high electrocaloric coefficient (ΔTc/ΔE), is demonstrated in a modified lead-free ferroelectric ceramic, BaTiO3, over a broad temperature range near the invariant critical point (ICP). Multiphase coexistence near ICP provides a larger entropy change compared with that of a pure ferroelectric-paraelectric transition. When coupled with the relaxor behavior, this leads to the observed giant ECE in BZT (x = 0.2) over a broad temperature range

Original languageEnglish (US)
Pages (from-to)1300-1305
Number of pages6
JournalAdvanced Functional Materials
Volume24
Issue number9
DOIs
StatePublished - Mar 5 2014

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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