Abstract
Rare-earth phosphates (REPO4) represent one candidate to contain minor actinides separated from used nuclear fuel. In this work, the Gd1−xYbxPO4 (0≤x≤ 1) series is synthesized via conventional solid-state reaction using Gd as the surrogate for trivalent actinides (Am, Cm), with microstructure/phase structure characterized by XRD, XPS, HRTEM and SEM as well. Solid solutions of monazite- and xenotime-type compounds are observed in the system. The structural boundary between two phases is based on the experimental temperature. The monazite→xenotime transformation is most likely to occur on a (200) monazite plane along the [020] zone. The pure xenotime-type crystalline phase with Gd0.9Yb0.1PO4 composition is obtained at 1600°C.
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