Observations on microstructure and crystal structure of sintered lithium metatitanate with excess Li |
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Authors: | Keisuke Mukai Kazuya Sasaki Takayuki Terai Akihiro Suzuki Tsuyoshi Hoshino |
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Affiliation: | 1. School of Engineering, The University of Tokyo, Tokyo, Japan;2. Fusion Research and Development Directorate, Japan Atomic Energy Agency, Japan |
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Abstract: | Crystal grain growth and crystallization of lithium metatitanate with excess Li (Li2+xTiO3+y), which is expected as an advanced ceramic breeder for a future DEMO fusion reactor, were studied in this paper. By the observation of sintered pellets using scanning electron microscope, it was shown that the Li2.1TiO3+y specimens, which have small grains (1–2 μm) and narrow size distribution, can be obtained by sintering in the temperature range from 1000 to 1100 °C. The observation also showed the rapid grain growth in the Li2.1TiO3 specimens sintered above 1150 °C. The changes in the crystal structure and the phase transformation with the increase of sintering temperature were also investigated by means of powder X-ray diffraction. Finally, the relationship between the grain growth and the phase state at high temperature was discussed. |
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