Microstructural evolution by in-situ TEM observations of oxides
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- NAKANO Hiromi
- Cooperative Research Facility Center, Toyohashi University of Technology
Bibliographic Information
- Other Title
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- The 64th CerSJ awards for academic achievements in ceramic science and technology: Microstructural evolution by in-situ TEM observations of oxides
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Abstract
In-situ observations using high-temperature transmission electron microscopy (TEM) is a promising technique for obtaining new findings and developing phenomenological theory for ceramic materials at high temperatures. By observing the changes in hydrothermal BaTiO3 due to heating, we clarify the vanishing mechanism of internal pores and the mechanism of BaCO3 phase generation/vanishing at high temperatures. Through observations of the grain growth of BaTiO3 prepared by radio-frequency plasma chemical vapor deposition, we calculate the grain-boundary diffusion coefficient, which is an important parameter controlling the sinterability of ceramics. Observations of the shrinkage and disappearance of Ba5Nb4O15, as well as simulations, indicate that high energy and low diffusivity at the grain boundary make grains vanish while maintaining a truncated spherical shape. Finally, observations of the structural changes in layered perovskite BaLn2Mn2O7 (Ln = Gd, Pr, Eu) reveal a first-order phase transition that has not been previously reported.
Journal
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- Journal of the Ceramic Society of Japan
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Journal of the Ceramic Society of Japan 119 (1385), 1-7, 2011
The Ceramic Society of Japan
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Details 詳細情報について
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- CRID
- 1390282680264689536
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- NII Article ID
- 130000420840
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- NII Book ID
- AA12229489
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- ISSN
- 13486535
- 18820743
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- NDL BIB ID
- 10931223
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed