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Dielectric and Piezoelectric Properties of Niobium-modified BiInO3–PbTiO3 Perovskite Ceramics with High Curie Temperatures

Published online by Cambridge University Press:  01 August 2005

Shujun Zhang ,
Ru Xia ,
Clive A. Randall ,
Thomas R. Shrout ,
Runrun Duan  and
Robert F. Speyer
Shujun Zhang*
Affiliation:
Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802
Ru Xia
Affiliation:
Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802
Clive A. Randall
Affiliation:
Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802
Thomas R. Shrout
Affiliation:
Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802
Runrun Duan
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Altanta, Georgia 30332
Robert F. Speyer
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Altanta, Georgia 30332
*
a) Address all correspondence to this author. e-mail: soz1@psu.edu
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Abstract

Piezoelectric ceramics with TC > 500 °C were projected in the perovskite BiInO3–PbTiO3 (BIPT) system based on their low tolerance factor (∼0.884). However, a stable perovskite phase could be synthesized only when the PbTiO3 (PT) content was greater than 75%. Furthermore, the large tetragonality (c/a > 1.08) and low electrical resistivity made the ceramics difficult to pole. Niobium-modified BIPT ceramics with PT contents of 80% and 85% were found to possess significantly lower dielectric loss at elevated temperatures, making it possible to polarize the materials. Piezoelectric properties were measured for a BIPT85–1.5 mol% Nb composition with a Curie temperature of 542 °C; the longitudinal piezoelectric coefficient and coercive field were found to be 60 pC/N and 125 kV/cm, respectively.

Keywords

CeramicFerroelectricPiezoelectric
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 8 , August 2005 , pp. 2067 - 2071
Copyright
Copyright © Materials Research Society 2005

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References

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