Superior Electrostrictive Effect in Relaxor Potassium Sodium Niobate Based Ferroelectrics

• DOI: 10.1021/acsami.0c06131
• Publication Date: 2020-05-25T04:38:45Z
• Authors: Bo Wu; Chunlin Zhao; Yanli Huang; Jie Yin; Wenjuan Wu; Jiagang Wu
• Keywords: Electrostriction

Electromechanical actuators with toxic lead-based electrostrictive materials dominate the market of high-precision electronics devices, so one urgent aims becomes how to explore new generation ecofriendly superior electrostriction behaviors. Herein, a strategy modifying active space for B-site in lead-free relaxor ferroelectrics arouses potential capacity electrostriction, including K0.5Na0.5NbO3 (KNN). Through co-doping Bi3+ and Ni2+, typical (1 – x)K0.5Na0.5NbO3–xBiNi2/3Nb1/3O3 (KNN-xBNN, 0.03 ≤ x 0.07) are constructed because incorporation dopants ions on A- or promotes structural disorder. Importantly, limited is obtained owing contracted oxygen-octahedron smaller A-site induced by lattice distortion. Benefiting from design strategy, remarkable enhancement coefficient Q33 ∼0.0456 m4/C2 achieved, which higher than those KNN-based also twice as large lead based materials. The exhibits relatively good electric field temperature-independent. A giant 0.0512 gained at high frequency 100 Hz, meeting requirement some commercial fuel injectors. Such may help us high-performance