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Impedance spectroscopy of SrBi2Ta2O9 and SrBi2Nb2O9 ceramics correlation with fatigue behavior

Published online by Cambridge University Press:  31 January 2011

Tze-Chiun Chen ,
Chai-Liang Thio  and
Seshu B. Desu
Tze-Chiun Chen
Affiliation:
Materials Science and Engineering Department, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
Chai-Liang Thio
Affiliation:
Materials Science and Engineering Department, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
Seshu B. Desu
Affiliation:
Materials Science and Engineering Department, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
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Abstract

In this research, a fatigue model for ferroelectric materials is proposed. The reasons for the electrical fatigue resistance of SrBi2Ta2O9 (SBT), SrBi2Nb2O9 (SBN), and PbZr1−xTixTixO3 (PZT) are discussed in terms of the bulk ionic conductivities of the compounds. To obtain the bulk ionic conductivity of SBT and SBN, we have used impedance spectroscopy which provides an effective method that allows us to separate the individual contributions of bulk, grain boundaries, and electrode-ferroelectric interfaces from the total capacitor impedance. The bulk ionic conductivities of SBT and SBN (∼10−7 S/cm) are much higher than those of the perovskite ferroelectrics, e.g., PZT (∼10−11–10−10 S/cm). The high ionic conductivities led us to conclude that the good fatigue resistance of SrBi2Ta2O9 and SrBi2Nb2O9 is due to easy recovery of defects. Specifically, oxygen vacancies entrapped within the capacitors are easily released, resulting in limited space charge buildup and domain wall pinning during the polarization reversal process. However, the oxygen vacancies in PZT are trapped at trap sites to become space charges, resulting in capacitor fatigue.

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Articles
Information
Journal of Materials Research , Volume 12 , Issue 10 , October 1997 , pp. 2628 - 2637
Copyright
Copyright © Materials Research Society 1997

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