THE INFRARED AND RAMAN SPECTRA OF $KTaO_{3}$
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Date
1966
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Ohio State University
Abstract
The reflectivity of $KTaO_{3}$ has been measured from 2.5-500 microns $(4000-20 cm^{-1})$. Two slightly temperature-dependent modes and one highly temperature-dependent low-frequency mode were observed over the temperature range $10-450^{\circ}K$. Substantial agreement with Cochran's ``soft'' mode theory was found with this mode obeying approximately $\omega_{T}(T) \propto \epsilon_0 (T)^{^{1}/_{2}}$. The supposed second order Raman spectrum was measured as a function of temperature and found to be surprisingly strong and complex.
Description
This work was supported in part by Air Force Cambridge Research Laboratories under contract AF 19(628)-395. The work of the Spectroscopy Laboratory is supported in part by the National Science Foundation, Grant No. GP4923. This work of the Research Laboratory of Electronics supported in part by the Joint Services Electronics Program under contract DA36-039-AMC-03200(E).
Author Institution: Spectroscopy Laboratory and Research Laboratory of Electronics, Massachusetts Institute of Technology
Author Institution: Spectroscopy Laboratory and Research Laboratory of Electronics, Massachusetts Institute of Technology