Particle size effect on the crystal structure of Y2O3 particles formed in a flame aerosol process

Bing Guo, Zhi Ping Luo

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Y2O3 is a material with wide applications. Its cubic and monoclinic polymorphs have significantly different mechanical and optical properties. The flame aerosol technique offers unique advantages in the synthesis of Y2O3 particles, but it also faces the challenge of phase control for Y2O3. One possible strategy for Y2O3 phase control is to utilize the particle size effect that causes the formation of the monoclinic phase at atmospheric pressure. In this study, the particle size effect on crystal structure was experimentally investigated for Y2O3 particles synthesized in a high-temperature flame aerosol process. A critical particle diameter of approximately 1.5 μm was found by single-particle electron diffraction. At the critical diameter, the probability is 50% for a particle to be either cubic or monoclinic. Particles significantly smaller than the critical diameter were all monoclinic, while those significantly larger were all cubic. The critical diameter was interpreted using an analysis that involves the free energy of a particle, which includes the bulk Gibbs free energy and the surface energy.

Original languageEnglish
Pages (from-to)1653-1658
Number of pages6
JournalJournal of the American Ceramic Society
Volume91
Issue number5
DOIs
Publication statusPublished - May 2008
Externally publishedYes

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Phase control
size effect
Aerosols
crystal structure
Particles (particulate matter)
Crystal structure
Particle size
particle size
aerosol
Gibbs free energy
Polymorphism
Interfacial energy
Electron diffraction
Free energy
Atmospheric pressure
Optical properties
Mechanical properties
Temperature
surface energy
particle

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Particle size effect on the crystal structure of Y2O3 particles formed in a flame aerosol process. / Guo, Bing; Luo, Zhi Ping.

In: Journal of the American Ceramic Society, Vol. 91, No. 5, 05.2008, p. 1653-1658.

Research output: Contribution to journalArticle

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