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Size-Dependent Pressure-Induced Amorphization in Nanoscale TiO 2

2006; American Physical Society; Volume: 96; Issue: 13 Linguagem: Inglês

10.1103/physrevlett.96.135702

1092-0145

Varghese Swamy, Alexei Kuznetsov, Leonid Dubrovinsky, Paul F. McMillan, Vitali B. Prakapenka, Guoyin Shen, Barry C. Muddle,

High-pressure geophysics and materials

We investigated the size-dependent high-pressure phase transition behavior of nanocrystalline anatase TiO2 with synchrotron x-ray diffraction and Raman spectroscopy to 45 GPa at ambient temperature. Pressure-induced amorphization results in a high-density amorphous (HDA) form when the starting crystallite size is < 10 mm. The HDA-TiO2 transforms to a low-density amorphous form at lower pressures. Harnessing the nanometer length scale thus provides a new window for experimental investigation of amorphization in poor glass formers and a synthesis route for new amorphous materials.