Phase relation and bulk thermal expansion studies in thoria–neodia system

Synthesis and characterization of Th1−xLnxO2−x/2 mixed-oxides

“…Indeed, polyphased systems, composed of additional hexagonal P31m structure (A-type, typical of Nd 2 O 3 ) were prepared for x Nd ! 0.49, which appeared in good agreement with the limit of incorporation reported by Mathews et al [22]. A + C polyphased oxides were then obtained even for the lowest thorium content (i.e.…”

“…4. XRD diagram of pure ThO 2 only showed the characteristic features of the Fm3m fluorite structure (F-type) that appeared in good agreement with literature [18][19][20][21][22][23][24]. This structure was stabilized up to x Nd 0.42.…”

“…Over the past 50 years, only a few studies were dedicated to the Th 1Àx Ln x O 2Àx/2 mixed-oxides [18][19][20][21][22][23][24]. All of them confirmed that ThO 2 crystallizes in the same structure than CeO 2 , PuO 2 and UO 2 (fluorite, Fm3m space group, commonly called F-type structure).…”

Phase relations and linear thermal expansion of cubic solid solutions in the Th1−xMxO2−x/2 (M=Eu, Gd, Dy) systems

“…Our recent studies [13] on the phase relations and thermal expansion behaviour of the thoria-neodymia system showed that, under conditions of slow cooling from 1673 K, 50 mol% of NdO 1.5 is soluble in ThO 2 while retaining the fluorite lattice, and that the coefficients of the average linear thermal expansion of the single-phase solid solutions increased with increasing NdO 1.5 content.…”

Prediction of oxygen potential in americium thorium oxides phase of a cermet fuel

“…There are many intensive studies on the phase relations of (RE, Th)O 2Àx , e.g., Refs. [37,38]. These results showed that, at high temperatures, RE elements can dissolve extensively into ThO 2 .…”