Thermodynamics of Ternary Nitride Formation by Ammonolysis: Application toLiMoN2, Na3WN3 and Na3WO3N

摘要

An approximate method for predicting the feasibility of synthesis of ternarynitrides from appropriate oxides and ammonia gas is outlined. The known thermodynamic data for binary oxides and nitrides may be a helpful guide in predicting the formation of ternary nitrides by ammonolysis of ternary oxides. When difference between the free energy of formation of ternaries from the binary oxides and binary nitrides is small, the predictions are expected to reliable. Such considerations suggest the ternary oxides containing the most electropositive metals (alkaline, alkaline earth, rare earth) will not form ternary nitrides by ammonolysis, but perhaps will form oxynitrides or decompose to the electropositive metal oxide/hydroxide and binary transition metal nitride. When the metals in the ternary oxide are from group V or greater, ternary nitride formation by reaction with ammonia is likely.