Giant Electrocaloric Response Over A Broad Temperature Range in Modified BaTiO3 Ceramics. (13th September 2013)

• Record Type: Journal Article
• Authors: Qian, Xiao‐Shi; Ye, Hui‐Jian; Zhang, Ying‐Tang; Gu, Haiming; Li, Xinyu; Randall, C. A.; Zhang, Q. M.
• Is Part Of: Advanced functional materials. Volume 24:Number 9(2014)
• Page Start: 1300
• Page End: 1305
• Publication Date: 2013-09-13
• Subjects: Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.201302386
• Languages: English
• ISSNs: 1616-301X

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <p>A giant electrocaloric effect (ECE) near room temperature is reported in a lead‐free bulk inorganic material. By tuning Ba(Zr_xTi_1–x)O₃ compositions which also exhibit relaxor ferroelectric response to near the invariant critical point, the Ba(Zr_xTi_1–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 (|ΔT_c/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.</p> </abstract>