Electrocaloric enhancement near the morphotropic phase boundary in lead-free NBT-KBT ceramics
Electrocaloric enhancement near the morphotropic phase boundary in lead-free NBT-KBT ceramics
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DOI：
10.1063/1.4934759
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发表时间：
2015-10-26
影响因子：
4
通讯作者：
Alford, Neil McN.
中科院分区：
文献类型：
--
作者：
Le Goupil, Florian;Bennett, James;Alford, Neil McN.
The electrocaloric effects (ECEs) of the morphotropic phase boundary (MPB) composition 0.82(Na0.5Bi0.5)TiO3-0.18(K0.5Bi0.5)TiO3 (NBT-18KBT) are studied by direct measurements. The maximum ECE Delta T-max = 0.73 K is measured at 160 degrees C under 22 kV/cm. This corresponds to an ECE responsivity (Delta T/Delta E) of 0.33 x 10(-6) K m/V, which is comparable with the best reported values for lead-free ceramics. A comparison between the direct and indirect ECE measurements shows significant discrepancies. The direct measurement of both positive and negative electrocaloric effect confirms the presence of numerous polar phases near the MPB of NBT-based materials and highlights their potential for solid-state cooling based on high field-induced entropy changes. (C) 2015 AIP Publishing LLC.
