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The structural phase transitions of single crystal TiO2-B nanoribbons wereinvestigated in-situ at high-pressure using the synchrotron X-ray diffractionand the Raman scattering. Our results have shown a pressure-inducedamorphization (PIA) occurred in TiO2-B nanoribbons upon compression, resultingin 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. HRTEMimaging reveals that the LDA phase has an {\alpha}-PbO2 structure with shortrange order. We propose a homogeneous nucleation mechanism to explain thepressure-induced amorphous phase transitions in the TiO2-B nanoribbons. Ourstudy demonstrates for the first time that PIA and polyamorphism occurred inthe one-dimensional (1D) TiO2 nanomaterials and provides a new method forpreparing 1D amorphous nanomaterials from crystalline nanomaterials.

Pressure-induced amorphization and polyamorphism in one-dimensional single crystal TiO2 nanomaterials