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J. Korean Ceram. Soc. > Volume 48(4); 2011 > Article
Journal of the Korean Ceramic Society 2011;48(4): 278.
doi: https://doi.org/10.4191/kcers.2011.48.4.278
Optical and Dielectric Properties of Reduced SrTiO3 Single Crystals
Bong-Hoon Kang
Department of Visual Optics, Far East University
ABSTRACT
The optical band gap energy for $SrTiO_3$ by reduction at high temperature was 3.15 eV. The reflectivity of reduced $SrTiO_3$ single crystals showed little variation, however, the reflectivity by the reduction condition had no effect. For the phonon mode at about 790 $cm^{-1}$, a blue-shift took place upon $N_2$ reduction and the decreased. However, a red-shift took place upon a $H_2-N_2$ reduction and the increased at the same phonon mode. With decreasing temperature the dielectric constant decreased rapidly. The thermal activation energies were 0.92-1.02 eV.
Key words: Reduction, Optical band gap, Infrared reflectivity, Thermal activation energy
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