Open AccessEffect of Annealing on Structural and Thermodynamic Properties of ThSiO4-ErPO4 Xenotime Solid Solution
Author(s) -
Anna Shelyug,
Mohamed Ruwaid Rafiuddin,
Adel Mesbah,
Nicolas Clavier,
Stéphanie Szenknect,
Nicolas Dacheux,
Xiaofeng Guo,
Alexandra Navrotsky
Publication year - 2021
Publication title -
inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 233
eISSN - 1520-510X
pISSN - 0020-1669
DOI - 10.1021/acs.inorgchem.1c01137
Subject(s) - annealing (glass) , metastability , tetragonal crystal system , solid solution , chemistry , thermodynamics , thorium , analytical chemistry (journal) , crystal structure , crystallography , materials science , metallurgy , chromatography , uranium , physics , organic chemistry
The effect of annealing on structural and thermochemical properties of a thorite-xenotime solid solution Th 1- x Er x (SiO 4 ) 1- x (PO 4 ) 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 .
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