Abstract
A-site K/Ce and B-site W/Cr co-substituted CaBi2Nb2O9 ceramics were synthesized by a conventional solid-state reaction process. The structures, piezoelectricity and electrical conduction behaviors were investigated in detail. The Ca0.95(K1/2Ce1/2)0.05Bi2Nb1.99(W2/3Cr1/3)0.01O9 ceramic exhibited best properties with a high d33 (piezoelectric coefficient) of ~ 18.4 pC/N and a high TC (Curie temperature) of ~ 917 °C. In addition, the ceramic displayed an excellent thermal stability performance such that d33 remained 94% of its initial value even after annealing at 900 °C for 2 h. The planar electromechanical coupling factor was observed to increase from 9.00% at room temperature to 15.24% at 600 °C. Furthermore, a high electrical resistivity of 1.16 × 105 Ω cm at 600 °C and a good fatigue property were also achieved with this composition. The Ca0.95(K1/2Ce1/2)0.05Bi2Nb1.99(W2/3Cr1/3)0.01O9 ceramic was found to be a promising candidate for high-temperature piezoelectric applications.
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