Giant strain responses and relaxor characteristics in lead-free (Bi_0.5Na_0.5)TiO₃–BaZrO₃ ferroelectric thin films

Abstract

A giant macro-scale strain value of 1.31% was obtained in the BNT-4BZ thin films, which is determined by the combination of domain switching and reversible electric-field-induced phase transitions between relaxor state and ferroelectric phase.

Enhanced ferroelectric properties in BiAlO3 modified lead‐free Mn‐doped Bi0.5(Na0.8K0.2)0.5TiO3 thin films

“…Similar changing trends in P max and P r were observed, both increasing firstly and then decreasing with the increase of BA content, while the E c changed oppositely, showing decreasing before increasing with the BA content. The increase of P max can be interpreted by the substitution of Al 3+ for Ti 4+ , which causes the distortion of TiO 6 lattice, 37 changes the size of the dipole, and ultimately increases the polarization 38 . Meanwhile, the oxygen vacancies produced by ion doping have the effect of pinning the domain wall, which leads to the increase of P r .…”

Electromechanical Actuators for Haptic Feedback with Fingertip Contact

“…This revealed the feasibility and potential value of piezoceramic thin films for transparent haptic actuators to be applied in display devices. Similar to bulk piezoelectric materials, considering the harm to the environment and health, research efforts and significant progresses have been made on lead-free piezoelectric films, including the KNN-based [147][148][149] and BNT-based [150] materials. The piezoelectric coefficients of these lead-free piezoceramics are close to PZT, and the longitudinal piezoelectric coefficient could be improved to 250 pm/V [151].…”