Abstract
The dielectric properties of Ag0·92Li0·08NbO3 (ALN8) ceramics were investigated in a broad frequency range (20 Hz −90 THz). The dielectric spectra of ALN8 ceramics mainly are impacted by the electrical conductivity at higher temperatures (above 500 K) and low frequencies (below 1 MHz) and the contribution of the soft relaxation mode, which frequency is below 50 cm−1. The electrical conductivity has two anomalies close to antiferroelectric and ferroelectric phase transition temperatures, respectively. The most pronounced decrease of the activation energy is observed close to the ferroelectric phase transition temperature. The values of activation energies are typical for oxygen vacancies transport. Some phononic modes are slightly temperature dependent close to the ferroelectric phase transition temperature confirm the influence of Ag, Nb and Li ions dynamics on the phase transitions.
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