Abstract
Urusov’s crystal energy theory of isomorphous substitutions was used to calculate mixing energies (interaction parameters) and critical decomposition temperatures (stability temperatures) of solid solutions in the systems Lu1–xLnxAsO4, Ln = Sm–Yb, Sc, Y with zircon structure, and La1–xLnxAsO4, Ln = Ce, Pr, Nd with monazite structure. For the Lu1–xLnxAsO4 system, a diagram of the thermodynamic stability of solid solutions is built that makes it possible to predict the thermodynamic stability of solid solutions. It is characterized by the presence of regions of thermodynamic stability and metastability of solid solutions. Above the critical temperatures, solid solutions are thermodynamically stable, and below the critical temperatures, they are metastable. The present results can be useful in choosing the ratio of components in “mixed” matrices, the amount of activator in luminescent, laser, and other practically important materials, as well as in matrices for immobilization of toxic and radioactive waste.
Published Version
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