Pressure-Induced Amorphization and Polyamorphism in One-Dimensional Single-Crystal TiO[subscript 2] Nanomaterials
- Jilin
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:
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 1002263
- Journal Information:
- J. Phys. Chem. Lett., Vol. 1, Issue (1) ; 01, 2010
- Country of Publication:
- United States
- Language:
- ENGLISH
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