Effect of Annealing on Structural and Thermodynamic Properties of ThSiO4-ErPO4Xenotime Solid Solution

Anna Shelyug, Mohamed Ruwaid Rafiuddin, Adel Mesbah, Nicolas Clavier, Stéphanie Szenknect, Nicolas Dacheux, Xiaofeng Guo, Alexandra Navrotsky

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1 Citation (Scopus)


The effect of annealing on structural and thermochemical properties of a thorite-xenotime solid solution Th1-xErx(SiO4)1-x(PO4)x 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. During annealing, the structure lost water and exsolved some thorianite phases. The thermodynamic parameters did not change much after annealing, suggesting that xenotime was not a low-temperature metastable phase but rather a stable structure able to withstand elevated temperatures regardless of the thorium content. The solid solution exhibited subregular behavior with the Margules function W(x) = (73.1 ± 20.1) - (125.7 ± 49.8)·x.

Original languageEnglish
Pages (from-to)12020-12028
Number of pages9
JournalInorganic Chemistry
Issue number16
Early online date30 Jul 2021
Publication statusPublished - 16 Aug 2021
Externally publishedYes


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