Short- and long-range order in La1-xSrxCoO3 and La1-xBaxCoO3

E. Efimova; V. Efimov; D. Karpinsky; A. Kuzmin; J. Purans; V. Sikolenko; S. Tiutiunnikov; I. Troyanchuk; E. Welter; D. Zajac; V. Simkin; A. Sazonov

doi:10.1016/j.jpcs.2008.03.040

Short- and long-range order in La_1-xSr_xCoO₃ and La_1-xBa_xCoO₃

E. Efimova
, V. Efimov^*
, D. Karpinsky
, A. Kuzmin
, J. Purans
, V. Sikolenko
, S. Tiutiunnikov
, I. Troyanchuk
, E. Welter
, D. Zajac
, V. Simkin
, A. Sazonov

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

20 Citations (Scopus)

Abstract

The short- and long-range order correlations of the crystal structure in the distorted perovskites La_1-xSr_xCoO₃ and La_1-xBa_xCoO₃ (0.0≤x≤0.5) have been studied by the neutron powder diffraction (NPD) and the Co K-edge X-ray absorption spectroscopy (XAS) measurements. The results of XAS and NPD indicate a local distortion around the Co³⁺ ions in LaCoO₃ at room temperature. The substitution of the La³⁺ ions by the Sr²⁺(Ba²⁺) ions leads to a gradual increase of the Co-O-Co angle and is accompanied by an increase of the mean square relative displacement (MSRD) of the Co-O bond. These results correlate with an increase of the oxygen amplitude vibration in the direction perpendicular to the Co-O bond. The possible explanation of the observed changes of the crystal and electronic structures in the above-mentioned cobaltites is discussed.

Original language	English
Pages (from-to)	2187-2190
Number of pages	4
Journal	Journal of Physics and Chemistry of Solids
Volume	69
Issue number	9
DOIs	https://doi.org/10.1016/j.jpcs.2008.03.040
Publication status	Published - Sept 2008

Keywords

Atomic correlations
Cobaltates
EXAFS and XANES
Local structure
Neutron diffraction

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10.1016/j.jpcs.2008.03.040

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title = "Short- and long-range order in La1-xSrxCoO3 and La1-xBaxCoO3",

abstract = "The short- and long-range order correlations of the crystal structure in the distorted perovskites La1-xSrxCoO3 and La1-xBaxCoO3 (0.0≤x≤0.5) have been studied by the neutron powder diffraction (NPD) and the Co K-edge X-ray absorption spectroscopy (XAS) measurements. The results of XAS and NPD indicate a local distortion around the Co3+ ions in LaCoO3 at room temperature. The substitution of the La3+ ions by the Sr2+(Ba2+) ions leads to a gradual increase of the Co-O-Co angle and is accompanied by an increase of the mean square relative displacement (MSRD) of the Co-O bond. These results correlate with an increase of the oxygen amplitude vibration in the direction perpendicular to the Co-O bond. The possible explanation of the observed changes of the crystal and electronic structures in the above-mentioned cobaltites is discussed.",

keywords = "Atomic correlations, Cobaltates, EXAFS and XANES, Local structure, Neutron diffraction",

author = "E. Efimova and V. Efimov and D. Karpinsky and A. Kuzmin and J. Purans and V. Sikolenko and S. Tiutiunnikov and I. Troyanchuk and E. Welter and D. Zajac and V. Simkin and A. Sazonov",

year = "2008",

month = sep,

doi = "10.1016/j.jpcs.2008.03.040",

language = "English",

volume = "69",

pages = "2187--2190",

journal = "Journal of Physics and Chemistry of Solids",

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TY - JOUR

T1 - Short- and long-range order in La1-xSrxCoO3 and La1-xBaxCoO3

AU - Efimova, E.

AU - Efimov, V.

AU - Karpinsky, D.

AU - Kuzmin, A.

AU - Purans, J.

AU - Sikolenko, V.

AU - Tiutiunnikov, S.

AU - Troyanchuk, I.

AU - Welter, E.

AU - Zajac, D.

AU - Simkin, V.

AU - Sazonov, A.

PY - 2008/9

Y1 - 2008/9

N2 - The short- and long-range order correlations of the crystal structure in the distorted perovskites La1-xSrxCoO3 and La1-xBaxCoO3 (0.0≤x≤0.5) have been studied by the neutron powder diffraction (NPD) and the Co K-edge X-ray absorption spectroscopy (XAS) measurements. The results of XAS and NPD indicate a local distortion around the Co3+ ions in LaCoO3 at room temperature. The substitution of the La3+ ions by the Sr2+(Ba2+) ions leads to a gradual increase of the Co-O-Co angle and is accompanied by an increase of the mean square relative displacement (MSRD) of the Co-O bond. These results correlate with an increase of the oxygen amplitude vibration in the direction perpendicular to the Co-O bond. The possible explanation of the observed changes of the crystal and electronic structures in the above-mentioned cobaltites is discussed.

AB - The short- and long-range order correlations of the crystal structure in the distorted perovskites La1-xSrxCoO3 and La1-xBaxCoO3 (0.0≤x≤0.5) have been studied by the neutron powder diffraction (NPD) and the Co K-edge X-ray absorption spectroscopy (XAS) measurements. The results of XAS and NPD indicate a local distortion around the Co3+ ions in LaCoO3 at room temperature. The substitution of the La3+ ions by the Sr2+(Ba2+) ions leads to a gradual increase of the Co-O-Co angle and is accompanied by an increase of the mean square relative displacement (MSRD) of the Co-O bond. These results correlate with an increase of the oxygen amplitude vibration in the direction perpendicular to the Co-O bond. The possible explanation of the observed changes of the crystal and electronic structures in the above-mentioned cobaltites is discussed.

KW - Atomic correlations

KW - Cobaltates

KW - EXAFS and XANES

KW - Local structure

KW - Neutron diffraction

UR - https://www.scopus.com/pages/publications/50949133724

U2 - 10.1016/j.jpcs.2008.03.040

DO - 10.1016/j.jpcs.2008.03.040

M3 - Article

AN - SCOPUS:50949133724

SN - 0022-3697

VL - 69

SP - 2187

EP - 2190

JO - Journal of Physics and Chemistry of Solids

JF - Journal of Physics and Chemistry of Solids

IS - 9

ER -

Short- and long-range order in La_1-xSr_xCoO₃ and La_1-xBa_xCoO₃

Abstract

Keywords

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