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Effect of Mn Doping on the Structural and Ferroelectric properties of SrBi2Ta2O9

Published online by Cambridge University Press:  01 February 2011

T. Sookawee ,
L. Pdungsap ,
P. Winotai ,
R. Suryanarayanan ,
V.M. Naik  and
R. Naik
T. Sookawee
Affiliation:
Department of Chemistry, Faculty of Science, Mahidol University, Bangkok 10400, Thailand
L. Pdungsap
Affiliation:
Department of Chemistry, Faculty of Science, Mahidol University, Bangkok 10400, Thailand
P. Winotai
Affiliation:
Department of Chemistry, Faculty of Science, Mahidol University, Bangkok 10400, Thailand
R. Suryanarayanan
Affiliation:
Department of Physics and Astronomy, Wayne State University, Detroit, MI, 48201, USA LPCS, UMR 8648, Bâl.410, Université Paris-Sud, 91405 Orsay, France
V.M. Naik
Affiliation:
Department of Natural Sciences, University of Michigan-Dearborn, Dearborn, MI, 48128, USA
R. Naik
Affiliation:
Department of Physics and Astronomy, Wayne State University, Detroit, MI, 48201, USA
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Abstract

SrBi2Ta2O9 (SBT) samples have been prepared by sol-gel technique with varying amount of excess Bi added to the starting composition. The excess Bi profoundly affects the dielectric and ferroelectric properties. The dielectric constant (ε) and remnant polarization increases from 80 and 1.4 μ C/cm2 for SBT with 1 mole % of excess Bi to 120 and 6.5 μ C/cm2 for SBT with 20 mole % of excess Bi. The Raman spectra, scanning electron microscopy images and the x-ray diffraction analysis show an improvement in structural quality of the samples with addition of excess Bi to the starting composition. The effect of Mn doping has also been studied by preparing SrBi2Ta2-x Mnx O9 (SBT-Mn) with x = 0 – 0.1. In the case of SBT-Mn samples, the XRD spectra revealed an unknown phase when x > 0.025. However, Raman spectra reveal the retention of Bi layer structure for all Mn compositions, with possibly small distortions. With Mn addition, ε increased to ∼ 140 for x < 0.005, but decreased to ≤ 120 when x > 0.015. The value of ε is independent of frequency from 60 to 85 kHz for all compositions of Mn. The effect of Mn addition resulted in a strong decrease in the area of the hysteresis loops.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 848: Symposium FF – Solid-State Chemistry of Inorganic Materials V , 2004 , FF6.19
Copyright
Copyright © Materials Research Society 2005

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References

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