IMF2017

(1-x)BNT-xBT ferroelectric ceramics, with x = 0; 8 and 12% mol, were prepared by the conventional ceramic processing method. The determination of the optimized sintering conditions for each composition allowed to the production of high density ceramic bodies free from secondary phase. Dielectric and thermal mechanical properties of unpoled (1-x)BNT-xBT samples were determined from cryogenic temperatures to 850 K in order to contribute to a better understanding of the phase diagram of the BNT-BT system. The results revealed that the temperature in which an anomaly is observed from the thermal strain curve coincides with the so-called depolarization temperature characterized by dielectric measurements for each composition. While the Burns temperature for traditional relaxors can be determined by both dielectric and thermal mechanical measurements and agree with each other, for the (1-x)BNT-xBT ceramics these measurements did not revealed such accordance.