%0 Journal Article
%T Pressure-induced amorphization and polyamorphism in one-dimensional single crystal TiO2 nanomaterials
%A Quanjun Li
%A Bingbing Liu
%A Lin Wang
%A Dongmei Li
%A Ran Liu
%A Bo Zou
%A Tian Cui
%A Guangtian Zou
%A Yue Meng
%A Ho-kwang Mao
%A Zhenxian Liu
%A Jing Liu
%A Jixue Li
%J Physics
%D 2012
%I arXiv
%R 10.1021/jz9001828
%X The structural phase transitions of single crystal TiO2-B nanoribbons were investigated in-situ at high-pressure using the synchrotron X-ray diffraction and the Raman scattering. Our results have shown a pressure-induced amorphization (PIA) occurred in TiO2-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. HRTEM imaging reveals that the LDA phase has an {\alpha}-PbO2 structure with short range order. We propose a homogeneous nucleation mechanism to explain the pressure-induced amorphous phase transitions in the TiO2-B nanoribbons. Our study demonstrates for the first time that PIA and polyamorphism occurred in the one-dimensional (1D) TiO2 nanomaterials and provides a new method for preparing 1D amorphous nanomaterials from crystalline nanomaterials.
%U http://arxiv.org/abs/1201.3396v1