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Ordered Structure in Lead Magnoniobate (PMN) by Resonant X-Ray Scattering

Published online by Cambridge University Press:  15 February 2011

V. Gosula ,
Haydn Chen ,
S. Teslic ,
T. Egami  and
S. Vakhrushev
V. Gosula
Affiliation:
Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801
Haydn Chen
Affiliation:
Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801
S. Teslic
Affiliation:
Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19014
T. Egami
Affiliation:
Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA 19014
S. Vakhrushev
Affiliation:
Phys. Tech. Inst., St. Petersburg, 194021 Russia
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Abstract

Half integer superlattice reflections characteristic of ordered structure in PMN (Pb(Mg1,3Nb2,3)O3) single crystal have been measured using resonant synchrotron x-ray scattering near the Pb LIII absorption edge. These superlattice peaks have been previously reported in PMN by electron diffraction, and were interpreted in the context of a two phase Nb/Mg ordering model to explain its relaxor ferroelectric behavior. Nevertheless, the microscopic origin of the superlattice peaks is controversial. Previous results have shown that the Nb atom contributes heavily to the superlattice peaks. However, the effective scattering factor for these peaks is significantly smaller than in the case of complete ordering. In addition, there is strong evidence that lead participates in the ordering.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 437: Symposium DD – Applications of Synchrotron Radiation to III , 1996 , 175
Copyright
Copyright © Materials Research Society 1996

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References

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