Thermodynamics and Stability of Rhabdophanes, Hydrated Rare Earth Phosphates REPO₄ · n H₂O.

ABSTRACT: 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. The energetics of the transformation of rhabdophane to monazite plus water and the enthalpy of formation of rhabdophane from the constituent oxides was determined by high temperature drop solution calorimetry. The former varies linearly with the ionic radius of the lanthanide, except for cerium. By combining the enthalpy of formation determined by high temperature drop solution calorimetry and the free energy of formation determi

SUBMITTER: Shelyug A 

PROVIDER: S-EPMC6304437 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature