Na0.5Bi0.5TiO3-0.06BaTiO3 relaxor ferroelectrics ceramic samples doped with 1 wt% of CuO, Fe2O3, Sb2O3, La2O3 and Ta2O5 were investigated by means of dielectric and acoustic emission methods in the high-temperature range. Dielectric constants exhibited a wide and smeared maximum at the temperature T m, accompanied by acoustic emission sharp bursts, but the dielectric constants exhibited no anomaly when further transiting into cubic paraelectric phase at the temperature T p, accompanied by acoustic emission sharp bursts, too. Based on acoustic emission data the shifts of these two temperatures, T m and T p, in dependence on a wt% of the incorporated ions as well as the acoustic emission count rate distribution in dependence on the incorporated ions radii were plotted and discussed.
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