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Abstract
The dielectric constant of unirradiated and gamma-ray irradiated ferroelectric scandium tantalate single crystals prepared by flux method has been studied as a function of temperature from 200K to 295K and frequency from 1KHz to 100WHz. After gamma-irradiation, the real part of the dielectric constant decreases and the imaginary part increases remarkably at low frequencies. The loss peak corresponding to the dielectric relaxation and the peak of the real part of the dielectric constant at transition temperature are broadened. These effects can be attributed to the increased density of free carriers and imperfections after irradiation.