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[论文]Lead-free piezoelectric materials

Giant electric-field-induced strain in lead-free piezoelectric materials

Li TY , Vongehr S,Tang SC,Dai YM,Huang X and Meng XK

Institute of Materials Engineering, National Laboratory of Solid State Microstructures, Collaborative Innovation Center of Advanced Microstructures, College of Engineering and Applied Sciences, Nanjing University, Jiangsu,China.

First-principles calculations are performed to investigate the structures, electrical, and magnetic properties of compressive BiFeO 3 films under electric-field and pressure perpendicular to the films. A reversible electric-field-induced strain up 10% is achieved in the compressive BiFeO 3 films. The giant strain originates from rhombohedral-tetragonal (R-T) phase transition under electric-filed, and is recoverable from tetragonal-rhombohedral (T-R) phase transition by compressive stress. Additionally,the weak ferromagnetism in BiFeO 3 films is largely changed in R-T phase transition under electric-filed and T-R phase transition under pressure – reminiscent of magnetoelectric effect and magnetoelastic effect. These results suggest exciting device opportunities arising from the giant filed-induced strain,large magnetoelectric effect and magnetoelastic effect.

Scientific Reports,2016,6 37092.