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 language | English |
|---|---|
| Pages (from-to) | 1780-1788 |
| Number of pages | 9 |
| Journal | Journal of Materials Science |
| Volume | 46 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2011 Mar 1 |
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering
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TEM observation of growth and phase transformation in nanometer-sized titanium oxide powder. / Lee, Gwan-Hyoung; Zuo, Jian Min.
In: Journal of Materials Science, Vol. 46, No. 6, 01.03.2011, p. 1780-1788.Research output: Contribution to journal › Article
TY - JOUR
T1 - TEM observation of growth and phase transformation in nanometer-sized titanium oxide powder
AU - Lee, Gwan-Hyoung
AU - Zuo, Jian Min
PY - 2011/3/1
Y1 - 2011/3/1
N2 - 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.
AB - 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.
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U2 - 10.1007/s10853-010-5001-7
DO - 10.1007/s10853-010-5001-7
M3 - Article
VL - 46
SP - 1780
EP - 1788
JO - Journal of Materials Science
JF - Journal of Materials Science
SN - 0022-2461
IS - 6
ER -