Abstract
Dielectric-constant measurements on KTaO/sub 3/:Li as a function of Li concentration, temperature, and frequency reveal the presence of a peak in the susceptibility near the paraelectric anomaly at 0 K. This effect is attributed to Li impurities which are ''frozen'' in an off-center position at the potassium site. For samples with a Li concentration of less than 24%, continuity of the elastic compliance ensures that a lattice polarization does not occur as for a true ferroelectric. Our results support the mean-field approach to the dynamics of impurities in ferroelectric hosts.
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