Nanocomposite mullite/mullite powders by spray pyrolysis

Daniel M. Dabbs, Nan Yao, Ilhan A. Aksay

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


A mullite/mullite nanocomposite powder has been synthesized, composed of nanometer-size 3Al2O3 · SiO2 ('3 : 2') mullite precipitates within a matrix of the high alumina 2Al2O3 · SiO2('2 : 1') mullite. Historically, the transition from the metastable high-alumina phase to the thermodynamically stable '3 : 2' phase of mullite has been thought to be a continuous process, involving a continuous solid solution between the two forms of mullite. In contradiction to this widely held view, our high resolution transmission electron microscopic characterization confirms that a first order phase transition between two distinct mullites occurs. The high degree of interface coherence between the precipitates and the matrix allows us to speculate that the mechanical properties of the matrix could be enhanced by a process similar to the precipitation hardening of metals.

Original languageEnglish (US)
Pages (from-to)127-130
Number of pages4
JournalJournal of Nanoparticle Research
Issue number1
StatePublished - 1999

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Atomic and Molecular Physics, and Optics
  • General Chemistry
  • Modeling and Simulation
  • General Materials Science
  • Condensed Matter Physics


  • Coherent interface
  • Mullite
  • Nanocomposite powder
  • Phase transition


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