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New high temperature morphotropic phase boundary piezoelectrics based on Bi(Me)O3-PbTiO3 ceramics

: Eitel, R.E.; Randall, C.A.; Shrout, T.R.; Rehrig, P.W.; Hackenberger, W.; Park, S.E.


Japanese Journal of Applied Physics. Part 1, Regular papers, short notes and review papers 40 (2001), No.10, pp.5999-6002
ISSN: 0021-4922
Journal Article
Fraunhofer IBMT ()

New morphotropic phase boundary (MPB) piezoelectrics, with ferroelectric phase transition (T-c) exceeding that of PbZrO3-PbTiO3 (PZT), were investigated. Based on a perovskite tolerance factor-T-c relationship, new high T-c MPB systems were projected in the Bi(MC)O-3-PbTiO3 system, where Me is a relatively large B+3-site cation. For the (1 - x)BiScO3-(x)PbTiO3 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 similar to 450 degreesC was determined with evidence of T-c's on the order of greater than or equal to 600 degreesC in the BiInO3 and BiYbO3 analogues, though issues of perovskite stability remain for the smaller tolerance end-member systems.