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Understanding the molar free energy to simulate phase separations (Na2O-SiO2)

In an Ideal solution, based on how many ways one can randomly arrange the constituents, one gets: $\Delta S_{mix} = -R(X_{A} \ln{X_{A}} + X_{B} \ln{X_{B}})$ with $X_{A}+X_{B} = 1$ being the relative ...
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