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

Cited 16 time in Web of Science Cited 16 time in Scopus

Lee, Gwan-Hyoung; Zuo, Jian-Min

Issue Date
Kluwer Academic Publishers
Journal of Materials Science, Vol.46 No.6, pp.1780-1788
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 < 1 (2) over bar1 > direction on the {101}- twin plane.
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Related Researcher

  • College of Engineering
  • Department of Materials Science & Engineering
Research Area 2D materials, 2차원 물질, Smiconductor process, semiconductor devices, 반도체 공정, 반도체 소자


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