LAUSR

Abstract In this work, the piezoelectric and thermal aging characteristics of 0.955(K,Na)NbO 3 ceramics doped with 0.045(Bi,M)ZrO 3 {M: Na, K, (Na,K), (Na,K,Li), (Na,Li), (K,Li), Li} were investigated. All the ceramics prepared by conventional solid-state process showed a rhombohedral−orthorhombic−tetragonal (R−O−T) or a R−T phase boundary, and the KNN-BNKLZ ceramic exhibited the highest d 33 value of ~300 pC/N ( T C ~337 °C). The effect of Li + on the piezoelectric and thermal aging properties of the KNN-BMZ ceramics was considerably larger than those of Na + and K + . The higher fraction of T phase relative to R phase with increasing Li + content is detrimental to the piezoelectric properties but beneficial to the thermal aging rate. The temperature-dependent behaviors of the charge sensitivity obtained from the prototype accelerometers were consistent with those of d 33 . The results indicate that the structural manipulation of the R−T phase boundary region is required to optimize the piezoelectric properties and thermal aging stability for accelerometer applications.