Rapid synthesis and chemical durability of Gd2Zr2-Ce O7 via SPS for nuclear waste forms
Source abstract
Abstract
Abstract To investigate the rapid immobilization of tetravalent actinides ( An 4+ ), Ce 4+ was used as simulated nuclear waste to be incorporated in Gd 2 Zr 2 O 7 ceramic. A series of compositions with the general formula of Gd 2 Zr 2- x Ce x O 7 (0.0 ≤ x ≤ 2.0) were rapidly fabricated through SPS process. That the Gd 2 Zr 2- x Ce x O 7 (0.0 ≤ x ≤ 1.0) ceramics with a single phase can be obtained at 1600 °C within 3 min as x was below 1.5. The lattice parameter and volume increase with enhancement of Ce content. The samples are in cubic-shaping crystal structure, as well as orderly arranged atomic layers. Meanwhile, the bulky density of samples increase with elevated Ce content, which is much higher than the conventionally obtained ones. In addition, the normalized release rates of Gd, Zr and Ce elements in Gd 2 ZrCeO 7 waste form are kept in low values (lower than 10 −4 g·m −2 d −1 ), which exhibits a reliable chemical stability.
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Research context
OpenAlex topics: Nuclear materials and radiation effects · Advanced Condensed Matter Physics · Nuclear Materials and Properties
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