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The phase transition temperatures and piezoelectric properties of (Bi0.5Na0.5)TiO3 (BNT) ceramics and single crystal were investigated. This study revealed that the high conductivity of BNT ceramics is attributed to the Bi vaporization during sinterint. The highest depolarization temperature Td of 187°C was obtained for the stoichiometric BNT ceramics, and Td tends to decrease as the composition deviates from stoichiometric BNT. Td of BNT single crystal was 158°C because of Na poor composition. BNT ceramics was easy to pole fully when the Bi/Na ratio is more than 1.0. The electromechanical coupling factor k33 and piezoelectric properties d33 of fully poled stoichiometric BNT ceramics were 0.459 and 72.9 pC/N, respectively. [ABSTRACT FROM AUTHOR]