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| - Oxygen Vacancy Ordering in the Double-layered Ruddlesden−Popper Cobaltite Sm2BaCo2O7−δ
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| Abstract
| - Ordering of oxygen vacancies within the double perovskite block of a cation-ordered n = 2 Ruddlesden−Popper cobaltite results in an unusual superstructure. Square pyramidal CoO5 units are linked via vertices creating hexagonal channels in each individual sheet. Neighboring sheets in the double perovskite block are rotated 90° with respect to each other.
- A new oxygen-deficient Ruddlesden−Popper (RP) cobaltite Sm2BaCo2O7−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 Sr2Mn2O5, 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 Sm2BaCo2O7−δ.
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| - O Vacancy Ordering in Sm2BaCo2O7−δ
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