Abstract
Lead-free ferroelectric solid solutions with the composition of (1-x)Bi0.5(Na0.77K0.18Li0.05)0.5TiO3-xSr(Nb0.5Ni0.5)O3 (x = 0–0.05) were successfully fabricated by the traditional solid-state reaction method and exhibited remarkable photostriction of visible light response. With doping of Sr(Nb0.5Ni0.5)O3 (SNN), the bandgap of the ferroelectric solid solutions decreases along with the weakening of coupling between A cation and BO6 octahedron. The reduction of the bandgap leads to the improvement of the light absorption efficiency. Further, the weakening of the A-O bond interactions associated with significant enhancement in relaxation behavior indicates that its constraints on the lattice are weakened. Therefore, the BO6 octahedrons are more easily deformed under the action of photogenerated carriers, which ultimately promotes photostriction. The 0.95Bi0.5(Na0.77K0.18Li0.05)0.5TiO3-0.05Sr(Nb0.5Ni0.5)O3 sample shows an excellent photoinduced strain (∼10.58 × 10-4), high photostrictive efficiency (∼10.58 × 10-12 m3 W-1), and fast response time (∼10 s).
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