Pebble fabrication of super advanced tritium breeders using a solid solution of Li $_{2+x}$ TiO $_{3+y}$ with Li $_{2}$ ZrO $_{3}$

Hoshino, Tsuyoshi

Demonstration power plant (DEMO) reactors require advanced tritium breeders with high tritium breeding ratios (TBRs) and increased stability at high temperatures. Li $_{2}$ TiO $_{3}$ with excess Li (Li $_{2+x}$ TiO $_{3+y}$ ) is one of the candidate materials for advanced tritium breeders. While Li $_{2+x}$ TiO $_{3+y}$ pebbles have some good properties, the TBR in Li $_{2+x}$ TiO $_{3+y}$ is smaller than that in Li $_{2}$ O because of its low Li density. Therefore, new Li-contained ceramic composites with not only high stability but also high Li density have been developed in JAEA. I focused on a solid solution with a new characteristic. Since the atomic radius of Li and Zr is similar, I surveyed the possibility of solid solution for a Li $_{2}$ O-TiO $_{2}$ -ZrO $_{2}$ (LTZO) system. The solid solution pebbles of LTZO are fabricated by an emulsion method are designated as LTZO20 (Li $_{2+x}$ TiO $_{3+y}$ with added 20 wt% Li $_{2}$ ZrO $_{3}$ ). The X-ray diffraction patterns of the sintered LTZO20 pebbles are approximately the same as those of Li $_{2+x}$ TiO $_{3+y}$ pebbles, and then Li $_{2}$ ZrO $_{3}$ disappeared. The results show that LTZO pebbles are not a two-phase material but a solid solution.

Language	:	English
Journal	:	Nuclear Materials and Energy (Internet)
Volume	:	9
Number	:
Pages	:	p.221 - 226
Publication Year/Month	:	2016/12
Meeting title	:	17th International Conference on Fusion Reactor Materials (ICFRM-17)
Held date	:	2015/10
Location (city)	:	Aachen
Location (country)	:	Germany
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Paper URL	:	https://doi.org/10.1016/j.nme.2016.05.004
DOI for research data	:	Link to research data related to this paper/report.
Keywords	:	no keyword
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Registration No. : BB20151668
JAEA Abstracts No. :
Paper Submission No. : 30524

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Pebble fabrication of super advanced tritium breeders using a solid solution of LiTiO with LiZrO

Pebble fabrication of super advanced tritium breeders using a solid solution of Li $_{2+x}$ TiO $_{3+y}$ with Li $_{2}$ ZrO $_{3}$