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Dielectric permittivity studies of reduced samples of NaNbO 3 single crystal in the range of temperatures 30-500 • C and frequency 20 Hz-1 MHz are reported. In this temperature range a relaxation process is observed in the frequency range of about 100 kHz. This is an additional process to the earlier reported one  . The obtained data were fitted to Cole-Cole formula. The dispersion step ∆ǫ (the maximum value of ∆ǫ =1000) is temperature dependent. The mean relaxation time τ does not obey thedoi:10.5488/cmp.2.4.655 fatcat:6ps7bapxunadtdnhz6lcvucp4e