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K nonstoichiometry effects in (Bi0.5K0.5+x )TiO3 (BKT) ceramics were studied with K contents varying in the range of −8≤ x ≤+1 mol% from the stoichiometric K0.5. 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 (Td ) reduced and vice versa.
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Sung et al. (2010) studied this question.
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