Atmospheric pressure synthesis of heavy rare Earth sesquioxides nanoparticles of the uncommon monoclinic phase

Bing Guo, Ashley S. Harvey, John Neil, Ian M. Kennedy, Alexandra Navrotsky, Subhash H. Risbud

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We report, for the first time, the atmospheric pressure synthesis of nonagglomerated nanoparticles (20-60 nm in diameter) of the uncommon monoclinic phase of some heavy rare earth sesquioxides RE 2O 3 (RE=Dy, Ho, Er, Tm, and Yb). The RE 2O 3 nanoparticles, prepared by a flame synthesis process, were characterized by X-ray diffraction, transmission electron microscopy, and electron energy loss spectroscopy. Monoclinic nanoparticles were formed when the flame temperature was sufficiently high; lower temperatures led to the formation of the normal cubic (C-type) phase. We explain the formation of the uncommon monoclinic phase on the basis of pressure-temperature phase equilibria, and the extra internal pressure induced by surface curvature of the nanoparticles.

Original languageEnglish
Pages (from-to)3683-3686
Number of pages4
JournalJournal of the American Ceramic Society
Issue number11
Publication statusPublished - Nov 2007
Externally publishedYes


ASJC Scopus subject areas

  • Ceramics and Composites

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