- Conference date: 20–23 July 2008
- Location: Campinas (Brazil)
The novel phenomenon of grain‐size dependent pressure induced amorphisation (PIA) in nano‐materials has been evidenced by several experiments in recent years. The open questions of the structural details of the high density amorphous (HDA) phase have been addressed in a x‐ray absorption spectroscopy (XAS) pressure study at the Ti K‐edge. The local environment of the cation, to within a few nearest neighbor shells, has been monitored up to where the HDA phase is stabilised. The XAS investigations of this study suggest that a precursor phase is observed before amorphization, the nature of which depends on the experimental conditions. A new structure is stabilized in all cases of samples decompressed from the HDA phase to ambient conditions, characterized by a five‐fold coordinated Ti.
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