Achieving large electric-field-induced strain in lead-free piezoelectrics

Materials Research Letters

卷:7

Márton Major¹  Deborah Schneider¹  Torsten Granzow²  Haosu Luo³  Patrick Tung⁴  John E. Daniels⁴  Richard Chen⁴ 

[1] Institute of Materials Science, Technische Universität Darmstadt;

[2] Luxembourg Institute of Science & Technology;

[3] Shanghai Institute of Ceramics;

[4] University of New South Wales;

关键词: Piezoelectricity;    relaxor ferroelectrics;    field-induced phase transitions;   

DOI  :  10.1080/21663831.2019.1570979

来源: DOAJ

【 摘 要 】

Lead-free piezoelectric single crystals of Fe-doped 0.95(Bi1/2Na1/2)TiO3-0.05BaTiO3 are shown to combine multiple mechanisms for high strain and an effective piezoelectric coefficient of up to 3260 pm/V. This is explained based on the analysis of superstructure reflections from diffuse synchrotron x-ray scattering. It depends on three factors: (1) the stabilization of a local tetragonal structure by (Fe’- $ V_O^{ \bullet \bullet } $ )• defect dipoles, (2) the reversible creation of a morphotropic phase boundary under field, and (3) the field-induced reversible transition between a short-range ordered relaxor and a long-range ordered ferroelectric state.

【 授权许可】

Unknown