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Synthesis and Reaction Chemistry of Nanosize Monosodium Titanate
Published on: February 23, 2016
Size-dependent pressure-induced amorphization in nanoscale TiO2
Varghese Swamy1, Alexei Kuznetsov, Leonid S Dubrovinsky
1Department of Materials Engineering, Monash University, P.O. Box 69M, Victoria 3800, Australia. Varghese.Swamy@eng.monash.edu.au
Physical Review Letters
|May 23, 2006
Summary
Nanocrystalline anatase titanium dioxide (<10 mm) undergoes pressure-induced amorphization, forming a high-density amorphous (HDA) phase. This HDA-TiO2 then transforms into a low-density amorphous form at lower pressures.
Area of Science:
- Materials Science
- Solid State Physics
- Nanotechnology
Background:
- Titanium dioxide (TiO2) is a crucial material with diverse applications.
- Understanding phase transitions in TiO2 under extreme conditions is vital for materials design.
- Nanocrystalline materials exhibit unique properties compared to their bulk counterparts.
Purpose of the Study:
- To investigate the size-dependent high-pressure phase transition behavior of nanocrystalline anatase TiO2.
- To explore pressure-induced amorphization in TiO2 at the nanoscale.
- To determine the critical crystallite size for amorphization.
Main Methods:
- Synchrotron X-ray diffraction was employed to analyze structural changes.
- Raman spectroscopy was used to probe vibrational modes and phase transformations.
- Experiments were conducted at ambient temperature up to 45 GPa.
Main Results:
- Nanocrystalline anatase TiO2 with crystallite sizes < 10 mm transforms into a high-density amorphous (HDA) form under high pressure.
- The HDA-TiO2 subsequently transforms into a low-density amorphous form at reduced pressures.
- Crystallite size significantly influences the pressure-induced amorphization pathway.
Conclusions:
- Harnessing the nanoscale provides a novel approach for studying amorphization in materials that are typically poor glass formers.
- This research offers a new synthesis route for creating novel amorphous titanium dioxide materials.
- Size-dependent amorphization in nanocrystalline TiO2 opens avenues for advanced materials development.
