Nucleation of Alpha Alumina in Boehmite Gel

Ladislav Pach, Rustum Roy, Sridhar Komarneni

Research output: Contribution to journalArticle

82 Scopus citations

Abstract

Transformation of boehmite-derived alumina gel to α-Al2O3 in unseeded gels is strongly influenced by the parent phase, θ-Al2O3. In seeded gels the perfect structure of the epitaxial substrate (α-Al2O3, 0.3 wt.%) influences the surrounding defect 0-phase resulting in (a) fewer imperfections due to lower transformation enthalpy to α-Al2O3, and (b) multiple nucleation sites of α-Al2O3 at the α-Al2O3 seed surface. The rate of transformation expressed for the same number of α-Al2O3 nuclei in unseeded and seeded gels indicates that it is faster in the unseeded gel than in the seeded gel.

Original languageEnglish (US)
Pages (from-to)278-285
Number of pages8
JournalJournal of Materials Research
Volume5
Issue number2
DOIs
StatePublished - Feb 1990

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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