Electromechanical Properties of Calcium Modified Lead Titanate Ceramics

Abstract

Some of the modified lead titanate ceramics exhibit large electromechanical anisotropy (i.e. large kfi ). However, their piezoelectric constant dj3 (=GOpC/N) is not Igrge. The primary cause of the low d, IS due to the relatively low dielectric constant K (=200) of ttese materials. In this paper, the calcium modified lead titanate ceramics were investigated to increase their d, , by increasing K with ion modifications while retaining their large kfi by optimizing the processing conditions. A large dG3 !=92pC/N? with large K (-456) and an infinite kfip were o tained in the composition Pb, Ca, Ti . 4(C01RW,R)0,0603 + 0.01 MnO sintered for 30 hrs an86poleGt g8kVlcm.