Reduction and phase transformation of Ce-doped zirconolites

Hayashizaki, Kohei; Hirooka, Shun; Yamada, Tadahisa*; Sunaoshi, Takeo*; Murakami, Tatsutoshi; Saito, Kosuke

Zirconolite is a wasteform that can immobilize Pu. Herein, zirconolites comprising Ce as a Pu simulant and Al as a charge compensator of Ce/Pu were synthesized by sintering raw CaO, ZrO $_{2}$ , TiO $_{2}$ , CeO $_{2}$ , and Al $_{2}$ O $_{3}$ powder mixtures at 1400 $^{circ}$ C in static air. The reduction behavior and phase transformation of zirconolites during their heat treatment in an Ar-H $_{2}$ gas flow were investigated. All zirconolite compositions first underwent reduction at 1050 $^{circ}$ C by forming a small domain of perovskite phase. Ce-Al co-doped zirconolite showed a smaller fraction of phase transformation in perovskite than Ce-doped zirconolite, indicating the advantage of using a charge compensator to prevent perovskite formation.

発表言語	:	English
掲載資料名	:	Ceramics (Internet)
巻	:	8
号	:	1
ページ数	:	p.24_1 - 24_12
発行年月	:	2025/03
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キーワード	:	Zirconolite; Wasteform; Reduction; Phase transformation

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論文URL	:	https://doi.org/10.3390/ceramics8010024
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抄録集掲載番号 : 53000443
論文投稿番号 : 29213

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