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http://dx.doi.org/10.9727/jmsk.2012.25.2.077

Phase Transition Studies on TiO2 anatase under High Pressure  

Hwang, Gil-Chan (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University)
Kim, Young-Ho (Department of Earth and Environmental Sciences and Research Institute of Natural Science, Gyeongsang National University)
Publication Information
Journal of the Mineralogical Society of Korea / v.25, no.2, 2012 , pp. 77-84 More about this Journal
Abstract
Anatase, one of the $TiO_2$ polymorphs, is known to show different phase transition paths depending on its crystalline and shape. Particle size of 15~25 nm anatase has been subjected to high-pressure Raman spectroscopy and X-ray diffraction studies using a diamond anvil cell. We observe that the starting sample transforms to an amorphous phase above approx. 20 GPa, which is retained upon pressure release to ambient condition. This is in contrast to previously established transition to baddeleyite phase and we suspect difference in the particle distribution state trigger phase instability of nanoparticles and hence amorphization.
Keywords
anatase; phase transition; amorphous; Raman spectroscopy; X-ray diffraction;
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