Journal of Materials Research


A kinetic study of the phase transformations in Al2O3 and Na2O · 6Al2O3 by a combined use of 27Al MAS NMR spectroscopy and x-ray diffraction: Importance of nucleation

S. Prabakara1, K.J. Raoa1 and C.N.R. Raoa1 c1

a1 Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore-560 012, India


Phase transformations of Al2O3 and Na2O · 6Al2O3 prepared by the gel route have been investigated for the first time by 27Al MAS NMR spectroscopy in combination with x-ray diffraction. Of particular interest in the study is the kinetics of the γ → α and γ → β transformations, respectively, in these two systems. Analysis of the kinetic data shows the important role of nucleation in both these transformations.

(Received March 07 1991)

(Accepted July 25 1991)


c1 Address correspondence to this author.