Thermochemistry of La$_{1-x}$Ln$_{x}$PO$_{4}$-monazites (Ln = Gd, Eu)

Neumeier, Stefan
Kegler, Philip
Arinicheva, Yulia
Shelyug, Anna
Kowalski, Piotr
Schreinemachers, Christian
Navrotsky, Alexandra
Bosbach, Dirk

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Publication date

January 2017

DOI

10.1016/j.jct.2016.11.003

Publisher

Elsevier BV

ISSN

0021-9614

Citation count (estimate)

Abstract

Enthalpy of formation (ΔH°f) of single phase orthophosphate solid solutions La1-xLnxPO4 (Ln = Eu, Gd; 0<x<1) with monazite structure has been determined by high temperature oxide melt solution calorimetry. The results show a non-ideal behavior of the excess enthalphy of mixing of the solid solutions. This effect is more pronounced for the La1-xGdxPO4 solid solution series and can be attributed to the larger ion size mismatch between La and Gd. The resulting excess enthalpies of mixing given by the Margules interaction parameter of 2.5 ± 2.6 kJ·mol-1 and 11.4 ± 3.1 kJ·mol-1 for La:Eu and La:Gd cases respectively are in good agreement with data from previous modelling studies. The data are consistent with the formation of thermodynamically st...

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Thermochemistry of La$_{1-x}$Ln$_{x}$PO$_{4}$-monazites (Ln = Gd, Eu)

Abstract

Extracted data

Thermochemistry of La$_{1-x}$Ln$_{x}$PO$_{4}$-monazites (Ln = Gd, Eu)

Abstract

Extracted data

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