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La2SrCr2O7F2: A Ruddlesden–Popper Oxyfluoride Containing Octahedrally Coordinated Cr4+ Centers

Zhang, R.H.; Read, G.; Lang, F.; Lancaster, T.; Blundell, S.J.; Hayward, M.A.

La2SrCr2O7F2: A Ruddlesden–Popper Oxyfluoride Containing Octahedrally Coordinated Cr4+ Centers Thumbnail


Authors

R.H. Zhang

G. Read

F. Lang

S.J. Blundell

M.A. Hayward



Abstract

The low-temperature fluorination of the n = 2 Ruddlesden–Popper phase La2SrCr2O7 yields La2SrCr2O7F2 via a topochemical fluorine insertion reaction. The structure-conserving nature of the fluorination reaction means that the chromium centers of the initial oxide phase retain an octahedral coordination environment in the fluorinated product, resulting in a material containing an extended array of apex-linked Cr4+O6 units. Typically materials containing networks of octahedrally coordinated Cr4+ centers can only be prepared at high pressure; thus, the preparation of La2SrCr2O7F2 demonstrates that low-temperature topochemical reactions offer an alternative synthesis route to materials of this type. Neutron diffraction, magnetization, and μ+SR data indicate that La2SrCr2O7F2 undergoes a transition to an antiferromagnetic state below TN ≈ 140 K. The structure–property relations of this phase and other Cr4+ oxide phases are discussed.

Citation

Zhang, R., Read, G., Lang, F., Lancaster, T., Blundell, S., & Hayward, M. (2016). La2SrCr2O7F2: A Ruddlesden–Popper Oxyfluoride Containing Octahedrally Coordinated Cr4+ Centers. Inorganic Chemistry, 55(6), 3169-3174. https://doi.org/10.1021/acs.inorgchem.6b00114

Journal Article Type Article
Acceptance Date Mar 21, 2016
Online Publication Date Mar 9, 2016
Publication Date Mar 21, 2016
Deposit Date Oct 18, 2016
Publicly Available Date May 25, 2018
Journal Inorganic Chemistry
Print ISSN 0020-1669
Electronic ISSN 1520-510X
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 55
Issue 6
Pages 3169-3174
DOI https://doi.org/10.1021/acs.inorgchem.6b00114
Public URL https://durham-repository.worktribe.com/output/1395243

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Copyright Statement
ACS AuthorChoice - This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes.






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