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Cycling‐ and heating‐induced evolution of piezoelectric and ferroelectric properties of CuO‐doped K 0.5 Na 0.5 NbO 3 ceramic
Author(s) -
Wang Tao,
Liao You,
Wang Dongmei,
Zheng Qiaoji,
Liao Jie,
Xie Fengyu,
Jie Wenjing,
Lin Dunmin
Publication year - 2019
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.15931
Subject(s) - materials science , ferroelectricity , ceramic , piezoelectricity , dipole , electric field , ferroelectric ceramics , quenching (fluorescence) , hysteresis , composite material , condensed matter physics , doping , natural bond orbital , hardening (computing) , mineralogy , optoelectronics , dielectric , optics , chemistry , physics , computational chemistry , organic chemistry , layer (electronics) , quantum mechanics , fluorescence , density functional theory
For accepter‐doped perovskite piezoelectric ceramics, macroscopic properties of the materials (eg, hardening, fatigue, and aging) are closely related to microscopic characteristics (eg, oxygen vacancies and defect dipoles). In this work, the relationship of macroscopic and microscopic characteristics in CuO‐doped K 0.5 Na 0.5 NbO 3 (KNN) ceramic has been studied by subjecting the material to electric field cycling, quenching, heating, and consequently aging. The introduction of CuO in KNN generates( Cu Nb ″ ′ − V O · · ) ′ and( V O · · − Cu Nb ″ ′ − V O · · ) · . The defect dipoles exhibit obviously the pinning effect on ferroelectric domains and thus induce a completely pinched/double P‐E loop and excellent hardening piezoelectricity of high Q m of 2235. With the destruction of short‐range symmetry uniformity between defect dipoles and ferroelectric dipoles induced by electric field cycling, quenching and heating, the ceramic can be depinned and softened. As a result, the depinned ceramic possesses an opened single ferroelectric hysteresis loop and the significantly decreasing Q m . A distinctive aging is observed in the depinned ceramic. This study provides deep insights into the evolution of electrical properties of accepter‐modified alkali niobate perovskite ceramics under electric field cycling, quenching, and heating.