Effect of Annealing on Structural and Thermodynamic Properties of ThSiO-ErPO Xenotime Solid Solution.

The effect of annealing on structural and thermochemical properties of a thorite-xenotime solid solution ThEr(SiO)(PO) was assessed. The samples synthesized at low temperatures and stored at room temperature for 2 years retained their tetragonal structures. This structure was also maintained after heating to 1100 °C.

Thermodynamics and Stability of Rhabdophanes, Hydrated Rare Earth Phosphates REPO · n HO.

Rare earth phosphates comprise a large family of compounds proposed as possible nuclear waste disposal forms. We report structural and thermodynamic properties of a series of rare earth rhabdophanes and monazites. The water content of the rhabdophanes, including both adsorbed and structural water, decreases linearly with increase in ionic radius of the rare earth.