Abstract
The far infrared reflectivity of KTa${\mathrm{O}}_{3}$ has been studied as a function of temperature from 12 to 463\ifmmode^\circ\else\textdegree\fi{}K. The results have been analyzed by means of a Kramers-Kronig method, and indicate a "soft" mode, lowering its frequency as the temperature is lowered towards the "Curie" temperature. This is in accordance with the temperature dependence of the dielectric constant interpreted through Cochran's theory.
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