The formation of cubic and monoclinic Y2O3nanoparticles in a gas-phase flame process

Autor:	Ashley S. Harvey, I. M. Kennedy, Subhash H. Risbud, Bing Guo
Rok vydání:	2006
Předmět:	chemistry Transmission electron microscopy Impurity Analytical chemistry chemistry.chemical_element Nanoparticle Yttrium Crystal structure Condensed Matter Physics Diluent Monoclinic crystal system Adiabatic flame temperature
Zdroj:	Philosophical Magazine Letters. 86:457-467
ISSN:	1362-3036 0950-0839
Popis:	Synthesis of phase-pure cubic and monoclinic Y2O3 nanoparticles (16–90 nm) was achieved in a gas-phase flame process. The effect of process parameters on the crystal structure of the Y2O3 nanoparticles was systematically investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Fuel gases, H2 or C2H4, at various flow rates, two yttrium precursors, an oxidant stream with varying degrees of N2 or Ar dilution and different burner diameters were used to examine the effects of chemical atmosphere, flame temperature, residence time and precursor concentration on the crystal structure of the synthesized Y2O3 nanoparticles. Regardless of the other process parameters, at diluent/O2 ratios of 0.25 or lower, monoclinic Y2O3 nanoparticles were obtained, whereas at diluent/O2 ratios of 1 or higher, cubic Y2O3 nanoparticles were obtained. A lower diluent/O2 ratio was related to higher flame temperature. Thermodynamic analyses suggest that high temperatures likely favour the formation of monocl...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a3dba7d6c1d3c8917405a9d12432da61 https://doi.org/10.1080/09500830600871194 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
Nepřihlášeným uživatelům se plný text nezobrazuje	K zobrazení výsledku je třeba se přihlásit.