Abstract
On the basis of our studies it results that dielectric properties of BaBi 2Nb 2O 9 ceramics are sensitive to axial pressure applied. The pressure causes an increase of dispersion in the real part of dielectric permittivity ɛ′( T, f) and a rise in the temperature T m at which the maximum in ɛ′( T, f) dependence occurs. The applied pressure induces in the ɛ′( T) dependence an additional step-like anomaly, which appears at the temperature T A < T m. The applied pressure shifts both T m and T A at the same rate, i.e. d T A/d X = d T m/d X = +14 °C/kbar at high axial pressure range, above the threshold pressure X thresh. The Vogel–Fulcher relationship is employed to determine the axial pressure influence on relaxor properties of BBN ceramics. The simulated order parameter q takes non-zero values below Burn‘s temperature T B, where the polar clusters appear on cooling. For pressures higher than 0.8 kbar, the T B changes at the rate d T B/d X = −200 °C/kbar. The decrease in the difference between Burn's T B and the freezing T f temperatures induced by the applied axial pressure is observed. This could be ascribed to the narrowing of temperature range of relaxor behavior.
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