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

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

doi:10.1021/cm8010138

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 journal › Article › peer-review

10 Citations (Scopus)

Abstract

A new oxygen-deficient Ruddlesden-Popper (RP) cobaltite Sm ₂BaCo₂O_7-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 ₂O_7-δ.

Original language	English
Pages (from-to)	6231-6237
Number of pages	7
Journal	Chemistry of Materials
Volume	20
Issue number	19
DOIs	https://doi.org/10.1021/cm8010138
Publication status	Published - 14 Oct 2008

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title = "Oxygen vacancy ordering in the double-layered ruddlesden-popper cobaltite Sm2BaCo2O7-δ",

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.",

author = "Gillie, {Lisa J.} and Joke Hadermann and Maryvonne Hervieu and Antoine Maignan and Christine Martin",

year = "2008",

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doi = "10.1021/cm8010138",

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T1 - Oxygen vacancy ordering in the double-layered ruddlesden-popper cobaltite Sm2BaCo2O7-δ

AU - Gillie, Lisa J.

AU - Hadermann, Joke

AU - Hervieu, Maryvonne

AU - Maignan, Antoine

AU - Martin, Christine

PY - 2008/10/14

Y1 - 2008/10/14

N2 - 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.

AB - 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.

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U2 - 10.1021/cm8010138

DO - 10.1021/cm8010138

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VL - 20

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EP - 6237

JO - Chemistry of Materials

JF - Chemistry of Materials

SN - 0897-4756

IS - 19

ER -

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

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