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Crystalline phase and electrical properties of lead‐free piezoelectric KNN ‐based films with different orientations
Author(s) -
Chen Wen,
Wang Lingyan,
Ren Wei,
Niu Gang,
Zhao Jinyan,
Zhang Nan,
Liu Ming,
Tian Ye,
Dong Ming
Publication year - 2017
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.14828
Subject(s) - piezoelectricity , materials science , piezoresponse force microscopy , polarization (electrochemistry) , ferroelectricity , homogeneity (statistics) , thin film , mineralogy , composite material , nanotechnology , optoelectronics , chemistry , dielectric , statistics , mathematics
Lead‐free piezoelectric 0.915K 0.5 Na 0.5 NbO 3 ‐0.075BaZrO 3 ‐0.01Bi 0.5 Na 0.5 TiO 3 ( KNN ‐ BZ ‐ BNT ) films were grown on Nb‐doped SrTiO 3 substrates with different orientations. The thin films show highly preferential orientations in accordance with the orientations of single crystalline substrates. The films all exhibit a weak contrast and remarkable homogeneity in the local static out‐of‐plane piezoresponse phase images, suggesting a strong self‐polarization. Combining with the analysis of XRD ‐ RSM , TEM and PFM , the crystalline phase of our samples was determined to be rhombohedral, which has the spontaneous polarization along [111] direction. Thus, the (100)‐oriented film demonstrates the most superior piezoelectric properties. Our detailed studies on structural and electrical properties of KNN ‐ BZ ‐ BNT films further clarify the structure‐property relationship and make a step closer to use this lead‐free material for many piezoelectric applications.