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Abstract
The infrared and terahertz spectra of lithium doped KTaO3 have been studied for the first time and compared with low-frequency dielectric measurements. The frequency of the soft mode decreases on cooling and follows the tendency found by previous hyper-Raman measurements. In Li-doped crystals the mode softening is not so pronounced and therefore, the mode contribution to static dielectric constant is lower. In addition to that a typical relaxor behavior is observed in dielectric spectroscopy (102–109 Hz). The rise of the reflectivity and dielectric loss is observed below 10 cm−1, which indicates presence of a central peak.