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Giant Electrocaloric Response Over A Broad Temperature Range in Modified BaTiO_3 Ceramics

机译:改性BaTiO_3陶瓷在宽温度范围内的巨大电热响应

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摘要

A giant electrocaloric effect (ECE) near room temperature is reported in a lead-free bulk inorganic material. By tuning Ba(Zr_xTi_(1-x))O_3 compositions which also exhibit relaxor ferroelectric response to near the invariant critical point, the Ba(Zr_xTi_(1-x))O_3 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 (|△T_C/△E| = 0.52 ×10~(-6) KmV~(-1) and AS/AE = 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.
机译:据报道,无铅块状无机材料中存在接近室温的巨大电热效应(ECE)。通过调节Ba(Zr_xTi_(1-x))O_3组成,它们也表现出对恒定临界点的弛豫铁电响应,Ba(Zr_xTi_(1-x))O_3块状陶瓷在x〜0.2时表现出很大的绝热降温。 4.5 K,等温熵变大8 J kg〜(-1)K〜(-1),EC系数大(|△T_C /△E | = 0.52×10〜(-6)KmV〜(- 1)在30 K温度范围内,AS / AE = 0.93×10〜(-6)J m kg〜(-1)K〜(-1)V〜(-1))。这些性能的总和表明了电热材料的通用解决方案,具有针对实际冷却应用的高性能。

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  • 来源
    《Advanced Functional Materials》 |2014年第9期|1300-1305|共6页
  • 作者单位

    Department of Electrical Engineering and Materials Research Institute The Pennsylvania State University University Park, PA 16802, USA;

    Materials Research Institute The Pennsylvania State University University Park, PA 16802, USA,School of Materials Science and Engineering Harbin Institute of Technology Harbin, 150001, PR China;

    Materials Research Institute The Pennsylvania State University University Park, PA 16802, USA,School of Material Science and Engineering Institute of Functional Material Shaanxi University of Technology Hanzhong, 723003, PR China;

    Department of Electrical Engineering and Materials Research Institute The Pennsylvania State University University Park, PA 16802, USA;

    Department of Electrical Engineering and Materials Research Institute The Pennsylvania State University University Park, PA 16802, USA;

    Materials Research Institute The Pennsylvania State University University Park, PA 16802, USA,Department of Materials Science and Engineering The Pennsylvania State University University Park, PA 16802, USA;

    Department of Electrical Engineering and Materials Research Institute The Pennsylvania State University University Park, PA 16802, USA,Tsinghua University Beijing, 100084, PR China;

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