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(a) Enthalpy of mixing (from DFT calculations) in the limit of full disorder (circles) and Guggenheim polynomial fitting using a subregular model (line) for Y2(SnxTi1–x)2O7. (b) Free energy of mixing in the subregular model at 500 K (showing the miscibility gap) and at 1000 K. (c) Phase diagram showing the immiscibility regions where the solid solution is predicted to be metastable with respect to phase separation using the subregular solid solution model.
