The 0.93(Bi0.5Na0.5)TiO3-0.07BaTiO(3) (BNB7T) piezoelectric single crystals and ceramics have been grown respectively by using the self-flux and solid-state-reaction methods. The real (epsilon') and imaginary (epsilon '') parts of the dielectric permittivity of BNB7T crystals and ceramics were investigated with and without an electric (E) poling as functions of temperature and frequency. The BNB7T crystal shows a stronger dielectric maximum at T-m similar to 240 degrees C than the ceramic at T-m similar to 300 degrees C. The dielectric permittivity of BNB7T ceramic shows an extra peak after poling at an electric field E-40 kV/cm in the region of 80-100 degrees C designated as the depolarization temperature (T-d). A wide-range dielectric thermal hysteresis was observed in BNB7T crystal and ceramic, suggesting a first-order-like phase transition. The dielectric permittivity epsilon' obeys the Curie-Weiss equation, epsilon' = C/(T/T-o), above 500 degrees C, which is considered as the Burns temperature (TB), below which polar nanoregions begin to develop and attenuate dielectric responses. (C) 2013 Elsevier B.V. All rights reserved.