Observations on microstructure and crystal structure of sintered lithium metatitanate with excess Li

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• 作者：Keisuke Mukai ; Kazuya Sasaki ; Takayuki Terai ; Akihiro Suzuki ; Tsuyoshi Hoshino
• 关键词：Lithium metatitanate ; Li2+xTiO3+y ; Advanced ceramic breeder ; DEMO blanket ; Crystal structure ; Microstructure
• 刊名：Fusion Engineering and Design
• 出版年：2012
• 出版时间：August, 2012
• 年：2012
• 卷：87
• 期：5-6
• 页码：836-839
• 全文大小：429 K

文摘

Crystal grain growth and crystallization of lithium metatitanate with excess Li (Li_2+xTiO_3+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 Li_2.1TiO_3+y specimens, which have small grains (1-2 ¦Ìm) and narrow size distribution, can be obtained by sintering in the temperature range from 1000 to 1100 ¡ãC. The observation also showed the rapid grain growth in the Li_2.1TiO₃ specimens sintered above 1150 ¡ãC. 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.