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 |
Bibliographical note
Funding Information:Acknowledgements This study was supported by the Brain Korea 21 program of materials education and research division at Seoul National University. We thank Prof. S. Kang at Seoul National University for advice.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering