Abstract
Photostrictive effect that has been discovered for over half a century is getting renewed interest in recent years in view of the great potentials for optomechanical applications. Ferroelectric materials represented by lead lanthanum zirconated titanate have been widely studied in this field because of their relatively large photostriction and fast photoresponse, but their wide bandgaps with limit response to visible light hinder further practical application. Here, visible-light-driven photostrictions of the order of 10−3 are discovered in Bi(Ni2/3Nb1/3)O3–PbTiO3 (BNNPT) ferroelectric solid solutions. Three BNNPT compositions with different phase structures, exhibiting notably different piezoelectric and photovoltaic properties, are selected to conduct the photostriction investigation, and their analogous photostrictive behaviors contradict with previous acknowledgment that the photostriction of ferroelectrics originates from the photovoltage-induced inverse piezoresponse. The nonuniform shifts of the XRD diffraction peaks under external laser illumination and the redshifts of the laser power dependent Raman modes disclose that the photostriction is mainly attributed to the light-induced distortion of BO6 octahedra. This study sheds insight into the mechanism of the photostriction of ferroelectrics.
Highlights
Ferroelectric materials represented by PLZT are the most promising candidates in view of practical applications because of their fast photoresponse, relatively large photostriction, good physicochemical stability, and mature machining characteristics
The above results are incompatible with the general acknowledgment that photostriction of ferroelectrics is generated by the photovoltage-induced inverse piezoresponse
By comparing the photostrictive performance of three BNNPT compositions with different phase structures, it is discovered that the photostriction strengths are not influenced by the polarization state, piezoelectric constant, and photovoltage, which are incompatible with the previous perception that photostriction of ferroelectrics is generated by the photovoltage-induced inverse piezoresponse, and the mechanism should be reappraised
Summary
Photostrictive effect, the light-induced shape deformation in materials, was discovered as early as the 1960s.1 it was not until the 1980s when photostriction was detected in lead lanthanum zirconated titanate (PLZT) ferroelectrics that this phenomenon attracted systematic research. Since the photostrictive effect was successfully explored in a series of materials, such as organic materials, multiferroic BiFeO3,14–16 and perovskite transition metal oxides. So far, ferroelectric materials represented by PLZT are the most promising candidates in view of practical applications because of their fast photoresponse, relatively large photostriction, good physicochemical stability, and mature machining characteristics. One big deficiency of PLZT is the wide optical bandgap, showing photoresponse limited to UV light. Photostrictive effect, the light-induced shape deformation in materials, was discovered as early as the 1960s.1 It was not until the 1980s when photostriction was detected in lead lanthanum zirconated titanate (PLZT) ferroelectrics that this phenomenon attracted systematic research.. PbTiO3–BiMeO3 (Me: transition metal) solid solutions have drawn much attention due to their large spontaneous polarization as well as high Curie temperature.. PbTiO3–BiMeO3 (Me: transition metal) solid solutions have drawn much attention due to their large spontaneous polarization as well as high Curie temperature.24–39 Another intriguing characteristic that concerns us is the wide bandgap tunability achieved by facilely adjusting the transition metal.. We select the (1−x)Bi(Ni2/3Nb1/3)O3–xPbTiO3 (BNNPT) system to conduct the photostriction research In previous reports, both good piezoelectric properties and the anomalous photovoltaic effect with large photovoltage have been obtained at the morphotropic phase boundary (MPB) with x = 0.625–0.65.30,34. Scitation.org/journal/apm of the likely strong correlation between the photostriction, piezoelectric, and photovoltaic performance.
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