Suppression of magnetic order in Sr3Fe2O4Cl2 by Fe-site substitution by cobalt.

Journal article

The low-temperature topotactic reduction of Sr(3)Fe(2-x)Co(x)O(5)Cl(2) oxychloride phases with LiH allows the preparation of phases of composition Sr(3)Fe(2-x)Co(x)O(4)Cl(2) (0 ≤ x ≤ 1). The reduced phases adopt body-centered tetragonal structures which are isostructural with Sr(3)Fe(2)O(4)Cl(2) and contain square-planar (Fe/Co)O(4) centers connected into apex-linked sheets, analogous to the CuO(2) sheets present in superconducting cuprate phases. As the cobalt concentration in Sr(3)Fe(2-x)Co(x)O(4)Cl(2) is increased the antiferromagnetic order of the Sr(3)Fe(2)O(4)Cl(2) host phase is suppressed, ultimately leading to spin-glass behavior, at low temperature, in Sr(3)Fe(2-x)Co(x)O(4)Cl(2) phases with x ≥ 0.8. The limited influence of cobalt substitution on the reactions which form the Sr(3)Fe(2-x)Co(x)O(4)Cl(2) phases is discussed and contrasted to that of the related SrFeO(3-δ)-SrFeO(2) system.

Authors: Dixon, E; Hayward, M

• Publication status: Published
• Journal: Inorganic chemistry
• Volume: 50
• Issue: 15
• Pages: 7250-7256
• Publication date: 2011-08-01
• DOI: 10.1021/ic200832n
• EISSN: 1520-510X
• ISSN: 0020-1669
• Language: English