Direct observations of La ordering and domain structures in La0.61Li0.17TiO3 by high resolution electron microscopy |
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Authors: | T Tsurui T Katsumata Y Inaguma |
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Institution: | 1. Institute for Materials Research, Tohoku University , Katahira 2-1-1, Aoba-ku, 980-8577, Japan tsurui@imr.tohoku.ac.jp;3. Department of Chemistry, Faculty of Science , Gakushuin University , Mejiro 1-5-1, Toshima-ku, Tokyo, 171-8588, Japan |
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Abstract: | La0.61Li0.17TiO3 microstructures have been studied by high resolution electron microscopy. A local lattice distortion occurs in the vicinity of the domain boundary region due to the twin with an angle of 89°. The average domain size of La0.61Li0.17TiO3 is greater than 20 nm. The domain size and structures of La0.61Li0.17TiO3 differ greatly from those of La-poor compounds, such as La0.55Li0.35TiO3. At a nanoscopic level, microdomains of 20–100 nm in size construct a two-dimensional structure in La-rich compounds, while microdomains of 5–10 nm in size construct a three-dimensional structure in La-poor compounds. In addition, the Li-ion conduction mechanisms for La-rich and La-poor compounds are two- and three-dimensional, respectively. |
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Keywords: | ionic conductor lanthanum lithium titanate transmission electron microscopy structural analysis |
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