Stéphanie Szenknect

For the first time, conditions allowing the formation of (Zr,U)SiO₄ solid solution with uranium content up to 60 mol% have been determined through the hydrothermal synthesis pathway.

Nd _{1−2 x} Ca _x U _x PO ₄ monazite–cheralite with x < 0.1 is prepared by wet chemistry route. Uranium incorporated in the monazite–cheralite structure is 100% U( iv ). Phosphates protect U against oxidation during the thermal treatment of the precursor in air.

Through the determination of the conditions adapted to the hydrothermal synthesis of ZrSiO₄, conditions allowing the formation of (Zr,Ce)SiO₄ solid solution with a Ce content up to 40% have been identified.