Pressure-induced Amorphization and Polyamorphism in One-Dimensional Single Crystal TiO2 Nanomaterials
The structural phase transitions of single-crystal TiO{sub 2}-B nanoribbons were investigated in situ at high pressure using synchrotron X-ray diffraction and Raman scattering. Our results have shown a pressure-induced amorphization (PIA) occurred in TiO{sub 2}-B nanoribbons upon compression, resulting in a high-density amorphous (HDA) form related to the baddeleyite structure. Upon decompression, the HDA form transforms to a low-density amorphous (LDA) form, while the samples still maintain their pristine nanoribbon shape. A high-resolution transmission electron microscopy (HRTEM) image reveals that the LDA phase has an {alpha}-PbO{sub 2} structure with short-range order. We propose a homogeneous nucleation mechanism to explain the pressure-induced amorphous phase transition in the TiO{sub 2}-B nanoribbons. Our study demonstrates for the first time that PIA and polyamorphism occurred in the one-dimensional (1D) TiO{sub 2} nanomaterials and provides a new method for preparing 1D amorphous nanomaterials from crystalline nanomaterials.
- Research Organization:
- Brookhaven National Laboratory (BNL) National Synchrotron Light Source
- Sponsoring Organization:
- DOE - OFFICE OF SCIENCE
- DOE Contract Number:
- AC02-98CH10886
- OSTI ID:
- 1020197
- Report Number(s):
- BNL--96047-2011-JA
- Journal Information:
- The Journal of Physical Chemistry Letters, Journal Name: The Journal of Physical Chemistry Letters Journal Issue: 1 Vol. 1
- Country of Publication:
- United States
- Language:
- English
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