A generalized rule for large piezoelectric response in perovskite oxide ceramics and its application for design of lead-free compositions

Abstract

High magnetoelectric effect in laminated composites of giant magnetostrictive alloy and lead-free piezoelectric ceramic J. Appl. Phys. 101, 104103 (2007)

Phase Diagram and Enhanced Piezoelectric Response of Lead‐Free BaTiO3–CaTiO3–BaHfO3 System

“…19 It is expected new clues can be provided to understand the transition complexity and enhanced piezoelectric properties in BT-based piezoelectric materials by investigating these compositions. It is known that piezoelectric response is dependent on multiple variables such as grain size, domain size, density, morphotropy, and defect structure.…”

Piezoelectric MEMS for energy harvesting

“…73 Another strategy adopted for designing lead-free compositions is based upon the trend between the atomic weight ratio of A to B sites ( R w = W a / W b ) and the longitudinal piezoelectric constant d 33 , as shown in Figure 7b . 74 It can be observed that 1/ R w for KNN ceramics (for Na/K ratio of 0.5) is similar to R w for PZT ceramics at the MPB composition, and both of these materials exhibit high piezoelectric response. Piezoelectric compositions show a large response when R w for A-site heavy perovskites and 1/ R w for B-site heavy perovskites are higher than 2.0.…”

Composition design rule for energy harvesting devices in piezoelectric perovskite ceramics

“…On the contrary, at the range of 0.5 rR W r 2.0, the d 33 xg 33 value cannot be observed because the perovskite materials do not show the piezoelectric response at the forbidden zone. [12] There are several related questions which were not identified in this study such as: "How is weight ratio related to phase transitions or polymorphism? ", "How is weight ratio related to intrinsic piezoelectric response?…”

“…Before the development, it cannot sufficiently assist the researchers who try to design a definitely new composition which nobody has studied. Hence, recently, we have proposed a rule for a high piezoelectric distortion constant (d 33 ) in the perovskite oxides [12]. It is "High d 33 values can be obtained by tuning the magnitude of atomic weight ratio between A and B sites (R w ¼ W A / W B ) in ABO 3 perovskite ceramics".…”

“…In addition, recently, lead-free piezoelectric ceramics [such as (Bi,Na)NbO 3 (BNT) and (K,Na)NbO 3 (KNN) based solid solutions etc.] have received the considerable attention to replace PZT-based materials owing to the global interest about environment [7][8][9][10][11][12][14][15][16][17][18][19][20][21].…”