TEM observation of growth and phase transformation in nanometer-sized titanium oxide powder

Gwan Hyoung Lee, Jian Min Zuo

Research output: Contribution to journalArticlepeer-review

Abstract

The growth and phase transformation in the nanocrystalline titania powders were studied using TEM and X-ray diffraction. Titania particles consisting of anatase phase grow through coalescence. After a nucleus of rutile is formed, it grows at the expense of the nearest anatase particles. A nucleus of rutile is formed in two ways. The nucleation of rutile occurs at the amorphous interface between the small anatase particles. In a large anatase particle, the martensitic transformation is dominant. It is estimated that these two kinds of phase transformation mechanisms are controlled by the intrinsic and extrinsic defects. A rutile particle has the low-energy surfaces with a lot of terraces. The growth direction of a rutile particle is related to the orientation of twin. A rutile particle grows along a ̄121 direction on the {101}-twin plane.

Original languageEnglish (US)
Pages (from-to)1780-1788
Number of pages9
JournalJournal of Materials Science
Volume46
Issue number6
DOIs
StatePublished - Mar 1 2011

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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