Variation of as a function of or in perovskite piezoelectric ceramics: (a) MPB compositions in PZT and BNT based compositions, two-phase-polymorphic compositions in KNN and BT based ceramics, and pure perovskite ceramics; (b) various compositions in perovskite piezoelectric ceramics; (c) -site heavy region; (d) -site heavy region; (e) merged graph of (c) and (d) (Refs. 1–15 and 18–29). Abbreviations are indicated in Table I.
(a) XRD patterns and (b) dielectric constant as a function of temperature for and ceramics.
SEM images of BT1 and L4 ceramics sintered at 1350 and for 2 h, respectively.
(or ), , and in perovskite piezoelectric ceramics.
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