K nonstoichiometry effects in (Bi 0.5 K 0.5+x )TiO 3 (BKT) ceramics were studied with K contents varying in the range of −8≤ x ≤+1 mol% from the stoichiometric K 0.5 . Within the range tested, a single BKT phase region was found to be at −1≤ x ≤+1 mol% and secondary phases started emerging with further K deficiency. Despite the formation of secondary phases, BKT perovskite with tetragonal symmetry was retained at all compositions. For nonstoichiometric BKT perovskite, a composition dependent structure property relation was observed; a decrease in tetragonality (c/a) caused piezoelectric coefficient (d 33 ) enhanced while depolarization temperature (T d ) reduced and vice versa.
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