科研之友
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摘要
As a ferroelectric material, BaTiO3 single crystal has the domain structure which can be changed by the application of mechanical stress and electric field. Therefore, the fracture behavior of the crystal is closely related with the domain switching. To understand the relationship between the fracture behavior and the domain switching clearly, the change of the indentation cracks and domain switching around the indentation under electric field perpendicular to the polarization of the samples were investigated through in situ observations by a differential interference contrast microscopy. The results show that for in-plane polarized sample, after completion of domain switching under the in-plane electric field perpendicular to the polarization of the crystal, the indentation cracks and the domains around the indentation are the same as the new indentation on the sample with new polarization state. In the case of applying in-plane electric field on the anti-plane polarized sample, the speed of the domain switching increases in the initial stage and decreases in the end stage, it has the maximum value as half of the domain switching completed. And the speed fluctuates in the first stage.
