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A combined diffraction and EXAFS study of LaCoO3 and La0.5Sr0.5Co0.75Nb0.25O3 powders

Published online by Cambridge University Press:  28 February 2017

E. A. Efimova ,
V. V. Sikolenko ,
D. V. Karpinsky ,
I. O. Troyanchuk ,
S. Pascarelli ,
C. Ritter ,
M. Feygenson ,
S. I. Tiutiunnikov  and
V. Efimov
E. A. Efimova*
Affiliation:
Joint Institute for Nuclear Research, 141980 Dubna, Russia
V. V. Sikolenko
Affiliation:
Joint Institute for Nuclear Research, 141980 Dubna, Russia REC “Functional nanomaterials” Immanuel Kant Baltic Federal University, 236041 Kaliningrad, Russia
D. V. Karpinsky
Affiliation:
Scientific-Practical Material Research Center NAS Belarus, 220072 Minsk, Belarus
I. O. Troyanchuk
Affiliation:
Scientific-Practical Material Research Center NAS Belarus, 220072 Minsk, Belarus
S. Pascarelli
Affiliation:
European Synchrotron Radiation Facility, BP 220, 38043 Grenoble, France
C. Ritter
Affiliation:
Institut Laue-Langevin, Grenoble, France
M. Feygenson
Affiliation:
Jülich Centre for Neutron Science, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
S. I. Tiutiunnikov
Affiliation:
Joint Institute for Nuclear Research, 141980 Dubna, Russia
V. Efimov
Affiliation:
Joint Institute for Nuclear Research, 141980 Dubna, Russia
*
a)Author to whom correspondence should be addressed. Electronic mail: efea@mail.ru
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Abstract

A combination of neutron diffraction, synchrotron X-ray diffraction, and high-resolution extended X-ray absorption fine structure measurements has been used to clarify the correlations between long- and local-range structural distortions across the spin-state transition in powders of LaCoO3 and La0.5Sr0.5Co0.75Nb0.25O3. The analysis of the diffraction data has revealed that the isotropic thermal parameters of Co–O bond abnormally increase below 100 K in both samples, while the temperature dependence of the average Co–O bond lengths is linear from 10 to 300 K. We also have found that the Co–O bond lengths are larger in La0.5Sr0.5Co0.75Nb0.25O3, as compared with the ones in LaCoO3. The X-ray absorption data showed an anomalous decrease of the Co–O bond lengths only for LaCoO3, in contrast to the bond length values obtained by diffraction. The structural anomalies observed by spectroscopy measurements are discussed in terms of the spin-state transition model.

Keywords

neutron diffractionEXAFSRietveld analysescobaltites
Type
Technical Articles
Information
Powder Diffraction , Volume 32 , Supplement S1 , September 2017 , pp. S52 - S55
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Copyright
Copyright © International Centre for Diffraction Data 2017 

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