Sol-gel synthesis of lambda-Na2O center dot xAl(2)O(3) films

Martucci A; Sartori S; Muffato A; Armelao L; Di Bartolomeo E; Traversa E; Guglielmi M

Journal of the American Ceramic Society, Vol.86, No.11, 1965-1968, 2003

DOI10.1111/j.1151-2916.2003.tb03591.x Export Citation

Sol-gel synthesis of lambda-Na2O center dot xAl(2)O(3) films

Martucci A, Sartori S, Muffato A, Armelao L, Di Bartolomeo E, Traversa E, Guglielmi M

Na2O.xAl(2)O(3) (x = 9, 11) films have been obtained by sol-gel method. Crystallization processes during heat treatments have been investigated by X-ray diffraction analysis. A metastable phase with the mullite structure, lambda-Na2O.xAl(2)O(3), has been observed starting from 800degreesC. Films remained stable after a heat treatment at 1000degreesC for 250 h. Impedance spectroscopy measurements showed that the films of lambda-Na2O.xAl(2)O(3) possess a large three-dimensional ionic conductivity at 400degreesC.