Phonon Properties of Co:TiO₂ Single Crystal

Abstract:

Phonon properties of cobalt doped rutile TiO₂ single crystal was investigated using a Raman Spectrometer with laser wavelength at 532 nm in the temperature range from 140 K to 750 K. The phonons modes of B_1g, E_g, and A_1g with the energy of 140 cm^-1, 450 cm^-1 and 600 cm^-1 are clearly observed. The second order phonon process is also observed at the energy of 250 cm^-1_. The temperature dependence of the A_1g, E_g modes become stiffen as lowering the temperature, while the B_1g mode becomes soften. The temperature dependence of the B_1g is found to be a signature as the effect of doping. Based on the harmonic model, this is explained due to the change the Ti-O coupling strengths of TiO₆ octahedral. A larger change is found for the longer distance of the Ti-O bond.

• Periodical: Materials Science Forum (Volume 827)
• Pages: 360-365
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.827.360
• Online since: August 2015
• Authors: H. Setiadi, A. Prasetyo, V. Suendo, Agustinus Agung Nugroho*
• Keywords: Anharmonicity, Co-Doped Rutile TiO₂, Phonon

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