Enhanced piezoelectric properties of sodium bismuth titanate (Na_0.5Bi_4.5Ti₄O₁₅) ceramics with B‐site cobalt modification

Abstract

Abstract The piezoelectric properties of the cobalt‐modified sodium bismuth titanate (Na 0.5 Bi 4.5 Ti 4 O 15 , NBT) piezoelectric ceramics were investigated. The piezoelectric properties of NBT ceramics were significantly enhanced by cobalt modification. The Curie temperature T C and piezoelectric constant d 33 for the 0.3 wt% cobalt‐modified NBT ceramics (NBT‐C3) were found to be 663 °C and 30 pC/N, respectively. Thermal annealing studies presented that the cobalt‐modified NBT ceramics possess stable piezoelectric properties, demonstrating that the cobalt‐modified NBT‐based ceramics are promising candidates for high temperature piezoelectric applications. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)