Phase transformation behavior and dielectric characteristics of BaTi1−x(Al1/2Nb1/2)xO3 (0.01≤x≤0.40) ceramics

► (Al1/2Nb1/2)4+ substitution caused the formation of BaAl2O4 second phase. ► Dielectric anomalous peak was shifted to low temperature with (Al1/2Nb1/2)4+ content increasing. ► A broad dielectric peak at 200-400 K was observed for the samples with high (Al1/2Nb1/2)4+ level.