La2SrCr2O7F2: A Ruddlesden–Popper oxyfluoride containing octahedrally coordinated Cr4+ centers
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 coordinati...
| Main Authors: | , , , , , |
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| Format: | Journal article |
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American Chemical Society
2016
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| _version_ | 1826264401641996288 |
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| author | Hayward, M Blundell, S Zhang, R Read, G Lang, F Lancaster, T |
| author_facet | Hayward, M Blundell, S Zhang, R Read, G Lang, F Lancaster, T |
| author_sort | Hayward, M |
| collection | OXFORD |
| description | 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. |
| first_indexed | 2024-03-06T20:07:13Z |
| format | Journal article |
| id | oxford-uuid:29498f1e-06a1-474b-b9db-acb431e035fb |
| institution | University of Oxford |
| last_indexed | 2024-03-06T20:07:13Z |
| publishDate | 2016 |
| publisher | American Chemical Society |
| record_format | dspace |
| spelling | oxford-uuid:29498f1e-06a1-474b-b9db-acb431e035fb2022-03-26T12:18:19ZLa2SrCr2O7F2: A Ruddlesden–Popper oxyfluoride containing octahedrally coordinated Cr4+ centersJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:29498f1e-06a1-474b-b9db-acb431e035fbSymplectic Elements at OxfordAmerican Chemical Society2016Hayward, MBlundell, SZhang, RRead, GLang, FLancaster, TThe 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. |
| spellingShingle | Hayward, M Blundell, S Zhang, R Read, G Lang, F Lancaster, T La2SrCr2O7F2: A Ruddlesden–Popper oxyfluoride containing octahedrally coordinated Cr4+ centers |
| title | La2SrCr2O7F2: A Ruddlesden–Popper oxyfluoride containing octahedrally coordinated Cr4+ centers |
| title_full | La2SrCr2O7F2: A Ruddlesden–Popper oxyfluoride containing octahedrally coordinated Cr4+ centers |
| title_fullStr | La2SrCr2O7F2: A Ruddlesden–Popper oxyfluoride containing octahedrally coordinated Cr4+ centers |
| title_full_unstemmed | La2SrCr2O7F2: A Ruddlesden–Popper oxyfluoride containing octahedrally coordinated Cr4+ centers |
| title_short | La2SrCr2O7F2: A Ruddlesden–Popper oxyfluoride containing octahedrally coordinated Cr4+ centers |
| title_sort | la2srcr2o7f2 a ruddlesden popper oxyfluoride containing octahedrally coordinated cr4 centers |
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