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Modified BiFeO3-PbTiO3 Morphotropic Phase Boundary (MPB) Piezoelectric Ceramics for High Temperature and High Power Applications

Published online by Cambridge University Press:  01 February 2011

JinRong Cheng  and
L. Eric Cross
JinRong Cheng
Affiliation:
Materials Research Institute, The Pennsylvania State University, University Park, PA 16802 School of Materials Science and Engineering, Shanghai University, Shanghai 201800, P.R. China
L. Eric Cross
Affiliation:
Materials Research Institute, The Pennsylvania State University, University Park, PA 16802
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Abstract

BiFeO3-PbTiO3 (BF-PT) crystalline solutions have been modified by La3+, Ga3+ and Ba2+ substituent. The modified BF-PT had morphotropic phase boundary (MPB), at which the ferroelectric rhombohedral phase transferred to the tetragonal symmetry. The piezoelectric properties at the MPB were strongly depended on different substituents. The modified BF-PT system showed the insulation resistivity up to 1012 ω·cm at room temperature. Lanthanum played a critical role making BF-PT softer to be poled to the piezoelectric state. Ga provided BF-PT additional polarization and breakdown strength with La substituent. In the system with La3+, Ga3+ and Ba3+ simultaneously, addition of Ba enhanced dielectric and piezoelectric activity. It was flexible to tailor BF-PT by using different substituents. In the vicinity of MPB, the Curie temperature Tc was above 385°C of BF-PT for La <10 at%, whereas the d33 constant was as high as 295 pC/N for one with La of 20 at%. The modified BF-PT revealed comparable performances to conventional Pb(Zr,Ti)O3 (PZT) ceramics, but in significantly lead reduced forms.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 785: Symposium D – Materials and Devices for Smart Systems , 2003 , D4.2
Copyright
Copyright © Materials Research Society 2004

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