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Internal Biasing in Relaxor Ferroelectric Polymer to Enhance the Electrocaloric Effect
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2015-07-14 , DOI: 10.1002/adfm.201501840 Xiaoshi Qian 1 , Hui-Jian Ye 2, 3, 4 , Tiannan Yang 5 , Wen-Zhu Shao 3 , Liang Zhen 3 , Eugene Furman 2 , Long-Qing Chen 5 , Qiming Zhang 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2015-07-14 , DOI: 10.1002/adfm.201501840 Xiaoshi Qian 1 , Hui-Jian Ye 2, 3, 4 , Tiannan Yang 5 , Wen-Zhu Shao 3 , Liang Zhen 3 , Eugene Furman 2 , Long-Qing Chen 5 , Qiming Zhang 1
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The relaxor ferroelectric materials, because of their large and reversible electric field induced polarization, have been demonstrated to possess giant electrocaloric effect (ECE) over a broad temperature range, which are attractive for refrigeration with high energy efficiency and environmental friendliness. However, high electric fields are required to generate the giant ECE in these materials, posing challenge for these materials in practical cooling devices which also require high reliability and low cost. Here, a general approach is reported, for example, establishing an internal bias field in these relaxor ferroelectric polymers, to significantly improve ECE which can be induced at low electric fields. It is demonstrated that in a polymer blend (nanocomposite) with a properly controlled normal ferroelectric in nanophase dispersion in the relaxor polymer matrix, the charge neutrality in the blends can cause an internal biasing field, leading to more than 45% enhancement in the ECE at low electric field (≈50 MV m−1). This internal biasing approach provides a universal strategy to enhance other low field responses such as the electromechanical response in relaxor ferroelectrics.
中文翻译：
弛豫铁电聚合物的内部偏置以增强电热效应
弛豫铁电材料由于其大且可逆的电场感应极化特性，已被证明在很宽的温度范围内具有巨大的电热效应（ECE），对于具有高能效和环境友好性的制冷具有吸引力。然而，需要高电场以在这些材料中产生巨大的ECE，从而在实际的冷却装置中对这些材料提出了挑战，该冷却装置也需要高可靠性和低成本。在此，报道了一种通用方法，例如，在这些弛豫铁电聚合物中建立内部偏置场，以显着改善可在低电场下诱发的ECE。-1）。这种内部偏置方法提供了一种通用策略，可以增强其他低场响应，例如张弛铁电体中的机电响应。
更新日期：2015-07-14
中文翻译：
弛豫铁电聚合物的内部偏置以增强电热效应
弛豫铁电材料由于其大且可逆的电场感应极化特性，已被证明在很宽的温度范围内具有巨大的电热效应（ECE），对于具有高能效和环境友好性的制冷具有吸引力。然而，需要高电场以在这些材料中产生巨大的ECE，从而在实际的冷却装置中对这些材料提出了挑战，该冷却装置也需要高可靠性和低成本。在此，报道了一种通用方法，例如，在这些弛豫铁电聚合物中建立内部偏置场，以显着改善可在低电场下诱发的ECE。-1）。这种内部偏置方法提供了一种通用策略，可以增强其他低场响应，例如张弛铁电体中的机电响应。
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