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Significant photostrictive response in lead‐free Bi 0.5 Na 0.5 TiO 3 ceramics under visible light illumination
Author(s) -
Fang Hanliang,
Chen Chen,
Zhang Faqiang,
Cao Minghe,
Yi Zhiguo
Publication year - 2021
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.17812
Subject(s) - materials science , visible spectrum , ceramic , optoelectronics , band gap , lead zirconate titanate , semiconductor , ultraviolet light , calcium titanate , laser , optics , ferroelectricity , composite material , dielectric , physics
Photostrictive effect that has been discovered for over half a century is getting renewed interest in recent years in view of the great potential for the wireless remote‐control technology. Compared with lead lanthanum zirconate titanate (PLZT) ferroelectrics that have been intensively studied, Bi 0.5 Na 0.5 TiO 3 (BNT) ceramics have a more environment‐friendly prospect. In this study, we present a significant photostrictive response for Bi 0.5 Na 0.5 TiO 3 ceramics under visible light illumination. The ultraviolet–visible diffuse reflectance spectrum indicates that the BNT ceramic is a direct bandgap semiconductor ( E g = 2.93 eV) with a long tail absorbance till wavelength ~560 nm. Transmission electron microscopy analysis reveals nanoscale domains and fluctuated local structure in BNT ceramics. A significant photostriction Δ L / L about 0.08% was observed for BNT when irradiated by 405‐nm laser at the power of 20 kW/m 2 . The nonuniform shifts of the X‐ray diffraction peaks under external laser illumination indicates that the photostriction is mainly attributed to the light‐induced distortion of crystalline lattice. Such a big deformation approaching that of piezoelectrics/ferroelectrics induced by electric field shows great promise for photo‐driven multifunctional applications.