Abstract
The domain boundary of congruent LiTaO3 (CLT) and stoichiometric LiTaO3 (SLT) were characterized on the nanoscale using scanning nonlinear dielectric microscopy. SLT exhibited a smooth domain boundary but CLT showed an irregular domain boundary. The nonlinear dielectric constant ε333 in the domain boundary of SLT changed abruptly from the domain but there was a gradual change in ε333 in the boundary of CLT. The linear dielectric constant in the domain boundary of SLT was slightly higher than that in the domain itself. In addition, the topography showed that only SLT had <1 nm dimensional deformation in the domain boundary.
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