Pressure induced amorphisation and the amorphous-amorphous transition in nano-TiO2: An X-ray Absorption Spectroscopy study

A. M. Flank, P. Lagarde, J. P. Itié, A. Polian, G. R. Hearne

Research output: Contribution to journalConference articlepeer-review

2 Citations (Scopus)

Abstract

The novel phenomenon of grain-size dependent pressure induced amorphisation (PIA) in TiO2 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 -30 GPa 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.

Original languageEnglish
Pages (from-to)20-24
Number of pages5
JournalAIP Conference Proceedings
Volume1092
DOIs
Publication statusPublished - 2009
Externally publishedYes
Event6th International Conference on Synchrotron Radiation in Materials Science - Campinas, Sao Paulo, Brazil
Duration: 20 Jul 200823 Jul 2008

Keywords

  • Amorphisation
  • Nano-TiO
  • XAS

ASJC Scopus subject areas

  • General Physics and Astronomy

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