Oxygen vacancy ordering in the double-layered ruddlesden-popper cobaltite Sm2BaCo2O7-δ

Lisa J. Gillie, Joke Hadermann, Maryvonne Hervieu, Antoine Maignan, Christine Martin

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

A new oxygen-deficient Ruddlesden-Popper (RP) cobaltite Sm 2BaCo2O7-δ (δ ≈ 1.0) has been synthesized and the crystal structure elucidated by Rietveld analysis of X-ray powder diffraction (XRD) data and transmission electron microscopy (TEM). The phase crystallizes in a primitive orthorhombic unit cell, with lattice parameters a = 5.4371(4) Å b = 5.4405(4) Å and c = 19.8629(6) Å, and space group Pnnm. Contrary to other oxygen-deficient cobalt RP phases, the oxygen vacancies are located in the equatorial positions of the [CoO] layers to give an intralayer structure similar to Sra2Mn 2O5, which is not usually observed for cobalt-containing materials. The Sm3+ and Ba2+ cations show a strong preference for distinct sites, with the majority of the larger Ba2+ cations situated in the perovskite block layers and Sm3+ cations predominantly in the rock salt layers. Magnetic susceptibility data demonstrate the strong antiferromagnetic (AFM) character of Sm2BaCo 2O7-δ.

Original languageEnglish
Pages (from-to)6231-6237
Number of pages7
JournalChemistry of Materials
Volume20
Issue number19
DOIs
Publication statusPublished - 14 Oct 2008

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Oxygen vacancies
Cations
Positive ions
Cobalt
Oxygen
Rietveld analysis
Magnetic susceptibility
Perovskite
X ray powder diffraction
Lattice constants
Salts
Crystal structure
Rocks
Transmission electron microscopy
cobaltite

Cite this

Gillie, Lisa J. ; Hadermann, Joke ; Hervieu, Maryvonne ; Maignan, Antoine ; Martin, Christine. / Oxygen vacancy ordering in the double-layered ruddlesden-popper cobaltite Sm2BaCo2O7-δ. In: Chemistry of Materials. 2008 ; Vol. 20, No. 19. pp. 6231-6237.
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abstract = "A new oxygen-deficient Ruddlesden-Popper (RP) cobaltite Sm 2BaCo2O7-δ (δ ≈ 1.0) has been synthesized and the crystal structure elucidated by Rietveld analysis of X-ray powder diffraction (XRD) data and transmission electron microscopy (TEM). The phase crystallizes in a primitive orthorhombic unit cell, with lattice parameters a = 5.4371(4) {\AA} b = 5.4405(4) {\AA} and c = 19.8629(6) {\AA}, and space group Pnnm. Contrary to other oxygen-deficient cobalt RP phases, the oxygen vacancies are located in the equatorial positions of the [CoO] layers to give an intralayer structure similar to Sra2Mn 2O5, which is not usually observed for cobalt-containing materials. The Sm3+ and Ba2+ cations show a strong preference for distinct sites, with the majority of the larger Ba2+ cations situated in the perovskite block layers and Sm3+ cations predominantly in the rock salt layers. Magnetic susceptibility data demonstrate the strong antiferromagnetic (AFM) character of Sm2BaCo 2O7-δ.",
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Oxygen vacancy ordering in the double-layered ruddlesden-popper cobaltite Sm2BaCo2O7-δ. / Gillie, Lisa J.; Hadermann, Joke; Hervieu, Maryvonne; Maignan, Antoine; Martin, Christine.

In: Chemistry of Materials, Vol. 20, No. 19, 14.10.2008, p. 6231-6237.

Research output: Contribution to journalArticle

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