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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. Prabakar (a1), K.J. Rao (a1) and C.N.R. Rao (a1)

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.

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2. R. Dupree , M. H. Lewis , and M. E. Smith , J. Appl. Cryst. 21, 109 (1988).

4. C. N. R. Rao and K. J. Rao , Phase Transitions in Solids (McGraw-Hill Inc., New York, 1978).

6. R. Collongues , D. Gourier , A. Kahn , J. P. Boilot , Ph. Colomban , and A. Wicker , J. Phys. Chem. Solids 45, 981 (1984).

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Journal of Materials Research
  • ISSN: 0884-2914
  • EISSN: 2044-5326
  • URL: /core/journals/journal-of-materials-research
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