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

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

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 (US)
Pages (from-to)3683-3686
Number of pages4
JournalJournal of the American Ceramic Society
Volume90
Issue number11
DOIs
StatePublished - Nov 2007

ASJC Scopus subject areas

  • Ceramics and Composites

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