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KMID : 0381920090390040341
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Korean Journal of Microscopy
2009 Volume.39 No. 4 p.341 ~ p.348
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Structure Determination of Nano-crystalline, BaTiO3, using Precession Electron Diffraction
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Song Kyung
Kim Youn-Joong
Kwon Ki-Hyun
Kim Jin-Gyu
Moon Sun-Min
Cho Nam-Hee
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Abstract
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The crystal structure of nano-crystalline, BaTiO3, with the average particle size of 100 nm was investigated using electron diffraction techniques. We characterized the precession electron diffraction system and then carried out the structure determination using precession electron diffraction and conventional selected area electron diffraction. As a result, it was revealed that BaTiO3 nano-crystalline exist as a mixture of tetragonal structure and cubic structure by precession electron diffraction technique. In addition, it could be turned out that BaTiO3 nano-crystalline is a core-shell structure consisted of a tetragonal phased core and a cubic phased surface layer by theoretical calculation. The thickness of the cubic surface layer was approximately 8.5 nm and the lattice parameters of cubic and tetragonal phases were a=3.999 A and a=3.999 A, c=4.022 A, respectively. Finally, it is expected that precession electron diffraction is more useful technique for structure determination of complicated nano-crystalline materials because of its higher spatial resolution and minimization of dynamical scattering effect.
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KEYWORD
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BaTiO3, Nano-crystalline, Core-shell structure, Precession electron diffraction
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