The formation of cubic and monoclinic Y2O3 nanoparticles in a gas-phase flame process

Bing Guo, A. Harvey, S. H. Risbud, I. M. Kennedy

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Synthesis of phase-pure cubic and monoclinic Y 2 O 3 nanoparticles (16-90nm) was achieved in a gas-phase flame process. The effect of process parameters on the crystal structure of the Y 2 O 3 nanoparticles was systematically investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Fuel gases, H 2 or C 2 H 4 , at various flow rates, two yttrium precursors, an oxidant stream with varying degrees of N 2 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 Y 2 O 3 nanoparticles. Regardless of the other process parameters, at diluent/O 2 ratios of 0.25 or lower, monoclinic Y 2 O 3 nanoparticles were obtained, whereas at diluent/O 2 ratios of 1 or higher, cubic Y 2 O 3 nanoparticles were obtained. A lower diluent/O 2 ratio was related to higher flame temperature. Thermodynamic analyses suggest that high temperatures likely favour the formation of monoclinic Y 2 O 3 nanoparticles in this flame process.

Original languageEnglish
Pages (from-to)457-467
Number of pages11
JournalPhilosophical Magazine Letters
Volume86
Issue number7
DOIs
Publication statusPublished - 1 Jul 2006
Externally publishedYes

Fingerprint

flames
Gases
vapor phases
Nanoparticles
nanoparticles
diluents
flame temperature
Crystal structure
Yttrium
crystal structure
Gas fuels
burners
yttrium
Fuel burners
Oxidants
Temperature
Dilution
dilution
flow velocity
Flow rate

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

The formation of cubic and monoclinic Y2O3 nanoparticles in a gas-phase flame process. / Guo, Bing; Harvey, A.; Risbud, S. H.; Kennedy, I. M.

In: Philosophical Magazine Letters, Vol. 86, No. 7, 01.07.2006, p. 457-467.

Research output: Contribution to journalArticle

Guo, Bing ; Harvey, A. ; Risbud, S. H. ; Kennedy, I. M. / The formation of cubic and monoclinic Y2O3 nanoparticles in a gas-phase flame process. In: Philosophical Magazine Letters. 2006 ; Vol. 86, No. 7. pp. 457-467.
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