Pressure-Induced Polyamorphic Transition in Nanoscale TiO[subscript 2]

Journal Article · Fri Jun 12 04:00:00 EDT 2009 · J. Aust. Ceram. Soc.

OSTI ID:1007098

Swamy, Varghese; Muddle, Barry C ^[1]

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1. Monash

The detection and characterization of pressure-induced amorphization in <10-nm-sized anatase TiO2 nanocrystals at pressures >20 GPa and ambient temperature is documented. The characterization employed in situ high-pressure angle-dispersive synchrotron X-ray diffraction and Raman spectroscopy in diamond-anvil cells. Comparative Raman spectroscopy allows the local structures of the high-density amorphous (HDA) form obtained at high pressures and its low-pressure (<10-15 GPa) low-density amorphous (LDA) analogue to be related to the baddeleyite-TiO2 and TiO2-II structures, respectively. The pressure-induced amorphization and the HDA-LDA transition in nanoscale TiO2 bear broad similarities to transitions in the Si and H2O systems.

• Research Organization: Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
• Sponsoring Organization: USDOE
• OSTI ID: 1007098
• Journal Information: J. Aust. Ceram. Soc., Journal Name: J. Aust. Ceram. Soc. Journal Issue: (2) ; 2008 Vol. 44; ISSN 0004-881X
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

43 PARTICLE ACCELERATORS
AMBIENT TEMPERATURE
DETECTION
RAMAN SPECTROSCOPY
SYNCHROTRONS
X-RAY DIFFRACTION