Flexoelectric characterization of BaTiO_3-0.08Bi(Zn_(1/2)Ti_(1/2))O_3

摘要

Flexoelectricity, the linear coupling between the strain gradient and the induced electric polarization, has been widely studied as a substitution for piezoelectricity among ceramic lead-free materials. Its potential in microano-scale sensing has especially gained attention, outweighing the performance of cutting edge lead-based piezoelectric materials. In this letter, the flexoelectric coefficient of lead-free ceramic BaTiO_3-0.08Bi(Zn_(1/2)Ti_(1/2))O_3 (BT-8BZT) was investigated in the transverse mode. The thermal dependence of flexoelectricity in BT-8BZT was investigated at temperatures ranging from 25 ℃ to 200 ℃, and the results were compared with those of Ba_xSr_(1-x)TiO_3 (BST) ceramics. The effective μ_(12) of BT-8BZT is ~25 μC/m at room temperature and can remain as high as ~13 μC/m at 200 ℃. This result suggests that BT-8BZT can be effectively used for microano-sensing within a broad range of temperatures.