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Antiferroelectric‐ferroelectric phase transition in lead‐free AgNbO 3 ceramics for energy storage applications
Author(s) -
Gao Jing,
Zhao Lei,
Liu Qing,
Wang Xuping,
Zhang Shujun,
Li JingFeng
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15780
Subject(s) - antiferroelectricity , dielectric , ferroelectricity , materials science , phase transition , ceramic , energy storage , hysteresis , condensed matter physics , ferroelectric ceramics , polarization (electrochemistry) , mineralogy , thermodynamics , composite material , optoelectronics , chemistry , physics , power (physics)
The high‐energy storage density reported in lead‐free AgNbO 3 ceramics makes it a fascinating material for energy storage applications. The phase transition process of AgNbO 3 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 AgNbO 3 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/cm 3 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 AgNbO 3 .
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