High-level nuclear waste in the United States comprises large volumes (tens of millions of
cubic meters), high total activities (billions of Curies) and highly diverse and complex …

The AXO4 monazite-type compounds form an extended family that is described in this
review in terms of field of stability versus composition. All the substitution possibilities on the …

Monazite and xenotime, the RE (PO4) dimorphs, are the most ubiquitous rare earth (RE)
minerals, yet accurate structure studies of the natural phases have not been reported. Here …

Monazite is a light rare earth element (LREE)-bearing phosphate mineral that is present in a
wide variety of rock types, has an extremely variable composition reflecting host rock …

Available publications on crystalline materials used to immobilize HLW and actinides have
been analyzed. Select compounds and solid solutions covered in this paper are phosphates …

Low thermal conductivity, matched thermal expansion coefficient and good compatibility are
general requirements for the environmental/thermal barrier coatings (EBCs/TBCs) and …

Complex anions play an important role in the chemistry of rare-earth elements. The most
important natural sources of lanthanides are silicates such as gadolinite, phosphates such …

Orthophosphate compounds of the type A (PO4) include the minerals monazite [RE (PO4)
with RE= the light rare-earth ions, eg, La, Ce, Nd…], xenotime [Y (PO4), and also …

A novel monazite-type high entropy (La 1/7 Ce 1/7 Pr 1/7 Nd 1/7 Sm 1/7 Eu 1/7 Gd 1/7) PO 4
(HE (7RE 1/7) PO 4) designed for the thermal/environmental barrier coatings (T/EBCs) …

The enthalpies of formation for the compounds (RE3+) PO4,(where RE= Sc, Y, La–Nd, Sm–
Lu) were determined by oxide-melt solution calorimetry. Calorimetric measurements were …