Abstract
Phonon properties of cobalt doped rutile TiO2single 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 B1g,Eg,and A1gwith the energy of 140 cm-1, 450 cm-1and 600 cm-1are clearly observed. The second order phonon process is also observed at the energy of 250 cm-1.The temperature dependence of the A1g, Egmodes become stiffen as lowering the temperature, while the B1gmode becomes soften. The temperature dependence of the B1gis 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 TiO6octahedral. A larger change is found for the longer distance of the Ti-O bond.
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