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a b s t r a c tLi 1−x Nb 1+x/5 O 3 (where x = 0, 0.025, 0.045, 0.075) ferroelectric ceramics were prepared by the solid-state reaction method; X-ray diffraction patterns indicate that single phase was formed for pure LN ceramics. The electrical behavior of the ceramics was studied by impedance spectroscopy technique in the 300-1000 • C temperature range. Impedance analysis was performed revealing a conductivity data which fitted in the modified power, ac (ω) = A · ω n 1 + B · ω n 2 and evidence of two types of conduction process. The low-frequency conductivity is due to long-range ordering (near frequency-independent) and highfrequency conduction due to the localized orientation hopping mechanism. The static conductivity is determined for all compositions from Cole-Cole diagrams, and the evolution vs temperature is studied as a function of the Li/Nb ratio.

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