New High Temperature Morphotropic Phase Boundary Piezoelectrics Based on Bi(Me)O3–PbTiO3 Ceramics

2001/10/01 by Richard E. Eitel, Clive A. Randall, Thomas R. Shrout +3 · 17 citations
Materials Science · Engineering · #Ferroelectric and Piezoelectric Materials #Glass properties and applications #Ultrasonics and Acoustic Wave Propagation

paper · doi:10.1143/jjap.40.5999

Abstract

New morphotropic phase boundary (MPB) piezoelectrics, with ferroelectric phase transition ( T c ) exceeding that of PbZrO 3 –PbTiO 3 (PZT), were investigated. Based on a perovskite tolerance factor- T c relationship, new high T c MPB systems were projected in the Bi(Me)O 3 –PbTiO 3 system, where Me is a relatively large B +3 -site cation. For the (1- x )BiScO 3 –( x )PbTiO 3 solid solution, a MPB was found at x -0.64 separating the rhombohedral and tetragonal phases, with correspondingly enhanced dielectric and piezoelectric properties. A transition temperature T c of ∼ 450°C was determined with evidence of T c 's on the order of ≥ 600°C in the BiInO 3 and BiYbO 3 analogues, though issues of perovskite stability remain for the smaller tolerance end-member systems.

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