Antiferroelectric‐ferroelectric phase transition in lead‐free AgNbO3 ceramics for energy storage applications |
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Authors: | Jing Gao Lei Zhao Qing Liu Xuping Wang Shujun Zhang Jing‐Feng Li |
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Affiliation: | 1. State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, China;2. Hebei Key Lab of Optic‐Electronic Information and Materials, College of Physics Science & Technology, Hebei University, Baoding, China;3. Advanced Materials Institute, Shandong Academy of Sciences, Jinan, China;4. Institute for Superconducting and Electronic Materials, Australian Institute of Innovative Materials, University of Wollongong, Wollongong, New South Wales, Australia |
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Abstract: | The high‐energy storage density reported in lead‐free AgNbO3 ceramics makes it a fascinating material for energy storage applications. The phase transition process of AgNbO3 ceramics plays an important role in its properties and dominates the temperature and electric field dependent behavior. In this work, the phase transition behavior of AgNbO3 ceramics was investigated by polarization hysteresis and dielectric tunability measurements. It is revealed that the ferrielectric (FIE) phase at room temperature possesses both ferroelectric (FE)‐like and antiferroelectric (AFE)‐like dielectric responses prior to the critical AFE‐FE transition point. A recoverable energy storage density of 2 J/cm3 was achieved at 150 kV/cm due to the AFE‐FE transition. Based on a modified Laudau phenomenological theory, the stabilities among the AFE, FE and FIE phases are discussed, laying a foundation for further optimization of the dielectric properties of AgNbO3. |
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Keywords: | dielectric materials/properties lead‐free ceramics phase transition |
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