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Large electrocaloric effect with ultrawide temperature span in Na1/2Bi1/2TiO3-based lead-free ceramics |
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| Authors: | Qiumei Wei Lovro Fulanovic Kodumudi Venkataraman Lalitha Mupeng Zheng Yudong Hou Mankang Zhu Linjing Liu Yunfei Chang Rui Xue |
| Affiliation: | 1. Key Laboratory of Advanced Functional Materials, Education Ministry of China, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, China Institute of Materials Science, Technical University of Darmstadt, Darmstadt, Germany;2. Institute of Materials Science, Technical University of Darmstadt, Darmstadt, Germany;3. Key Laboratory of Advanced Functional Materials, Education Ministry of China, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, China;4. Functional Materials and Acousto-Optic Instruments Institute, School of Instrumentation Science and Engineering, Harbin Institute of Technology, Harbin, China;5. Beijing Building Materials Testing Academy Co., Ltd., Beijing, China |
| Abstract: | Innovative cooling technologies are recognized by many industries as a crucial part of their system design. A large electrocaloric effect (ECE) and extended working temperature are the key issues hindering the realization of electrocaloric refrigeration technology. In this work, large ECE (ΔT = 0.8–0.9°C @ 4 kV/mm) with an ultrawide temperature span from 30 to 120°C is noted for lead-free (Na1/2Bi1/2)0.80Sr0.20(Zn1/3Nb2/3)xTi1-xO3 ceramics. The excellent ECE performance can be ascribed to the evolution of polar nanoregions. Our work suggests that this material is promising for applications in solid-state refrigeration systems with a broad range of operating temperatures. |
| Keywords: | dielectric electrocaloric effect lead–free ferroelectrics Na0.5Bi0.5TiO3 relaxor behavior |