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Evidence for Antiferroelectric Behavior in KNbO3/KTaO3 Superlattices

Published online by Cambridge University Press:  01 February 2011

J. Sigman ,
H. M. Christen ,
P. H. Fleming ,
L. A. Boatner  and
D. P. Norton
J. Sigman
Affiliation:
Department of Materials Science and Engineering, University of Florida, P.O. Box 116400, Rhines Hall, Gainesville, FL 32611.
H. M. Christen
Affiliation:
Solid State Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831.
P. H. Fleming
Affiliation:
Solid State Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831.
L. A. Boatner
Affiliation:
Solid State Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831.
D. P. Norton
Affiliation:
Department of Materials Science and Engineering, University of Florida, P.O. Box 116400, Rhines Hall, Gainesville, FL 32611.
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Abstract

The dielectric response in artificially layered 1x1 KTaO3/KNbO3 perovskite superlattice structures is reported. While KTaO3 and KNbO3 are ferroelectric or paraelectric, respectively, superlattices appear antiferroelectric based on an increase in dielectric constant with applied dc bias. This “positive tunability” in dielectric response occurs at the same temperature region where a structural phase transition is observed. This dielectric behavior is inconsistent with the nonlinear response for either paraelectric or ferroelectric materials. However, an increase in the dielectric constant with applied electric field is consistent with antiferroelectric behavior. The antiferroelectric ordering correlates with cation modulation imposed by the superlattice.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 720: Symposium H – Materials Issues for Tunable RF and Microwave Devices III , 2002 , H6.4
Copyright
Copyright © Materials Research Society 2002

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