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.

Language	:	English
Journal	:	Ceramics (Internet)
Volume	:	8
Number	:	1
Pages	:	p.24_1 - 24_12
Publication Year/Month	:	2025/03
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Paper URL	:	https://doi.org/10.3390/ceramics8010024
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Keywords	:	Zirconolite; Wasteform; Reduction; Phase transformation
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Registration No. : AA20240643
JAEA Abstracts No. : 53000443
Paper Submission No. : 29213

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