Stability of the low temperature polymorphs (y and image) of Lu-doped Y2Si2O7 Original Research Article

The present study analyses the formation kinetics as well as the thermodynamic stability of the αα and y polymorphs of Lu-doped Y2Si2O7. The analysis has been carried out by means of both in situ and ex situ diffraction experiments. 29Si MAS-NMR spectroscopy has also been used to complement the information obtained from the diffraction measurements. The results indicate that both αα and y polymorphs display the same temperature stability field View the MathML source(975∘C⩽T<1075∘C) although crystallization kinetics of αα seems to be faster than that of y.