Atmospheric Pressure Synthesis of Heavy Rare Earth Sesquioxides Nanoparticles of the Uncommon Monoclinic Phase

Autor:	Subhash H. Risbud, Alexandra Navrotsky, Ian M. Kennedy, Bing Guo, John M. Neil, Ashley S. Harvey
Rok vydání:	2007
Předmět:	Nanocrystal Atmospheric pressure Chemistry Stereochemistry Transmission electron microscopy Electron energy loss spectroscopy Phase (matter) Materials Chemistry Ceramics and Composites Analytical chemistry Nanoparticle Adiabatic flame temperature Monoclinic crystal system
Zdroj:	Journal of the American Ceramic Society. 90:3683-3686
ISSN:	1551-2916 0002-7820
Popis:	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 RE2O3 (RE=Dy, Ho, Er, Tm, and Yb). The RE2O3 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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2f3746b8611f713a2fc6aafd54d1f7e9 https://doi.org/10.1111/j.1551-2916.2007.01961.x Zobrazit plný text záznamu Plný text ve formátu PDF