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

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

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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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