Effect of Domain Size on the Coercive Field of Orthorhombic (Li, K, Na)NbO3 Ceramics

다국어 초록 (Multilingual Abstract)

Li0.02(K0.45Na0.55)0.98NbO3 [Li0.02KNN] ceramics were prepared by using the conventional solid state reaction method. The domain structures of orthorhombic Li0.02KNN ceramics were observed using a piezoelectric force microscope (PFM). A highly complicated configuration of domains was observed in grains with sizes over 15 μm, where all types of domains exist together. In order to evaluate the domain size, we only considered 90 domains in simple lamellar twinning. In grains with sizes of 3 ~ 15 μm, the simple lamellar twinning was observed and domain widths were about 275 ~ 300 nm. In smaller grains with sizes below 3 μm, the domain width was wider than it was for larger grains (>3 μm). The coercive field significantly decreased with decreasing domain size.

참고문헌 (Reference)

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