La2SrCr2O7F2: A Ruddlesden-Popper oxyfluoride containing octahedrally coordinated Cr(4+) 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 |
| Language: | English |
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American Chemical Society
2016
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| _version_ | 1826257339825520640 |
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| author | Zhang, R Read, G Lang, F Lancaster, T Blundell, S Hayward, M |
| author_facet | Zhang, R Read, G Lang, F Lancaster, T Blundell, S Hayward, M |
| author_sort | Zhang, R |
| 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 Cr(4+)O6 units. Typically materials containing networks of octahedrally coordinated Cr(4+) 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 Cr(4+) oxide phases are discussed. |
| first_indexed | 2024-03-06T18:16:38Z |
| format | Journal article |
| id | oxford-uuid:04d579b3-5d98-4975-9bf7-1d649eb04ef8 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T18:16:38Z |
| publishDate | 2016 |
| publisher | American Chemical Society |
| record_format | dspace |
| spelling | oxford-uuid:04d579b3-5d98-4975-9bf7-1d649eb04ef82022-03-26T08:53:51ZLa2SrCr2O7F2: A Ruddlesden-Popper oxyfluoride containing octahedrally coordinated Cr(4+) centersJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:04d579b3-5d98-4975-9bf7-1d649eb04ef8EnglishSymplectic Elements at OxfordAmerican Chemical Society2016Zhang, RRead, GLang, FLancaster, TBlundell, SHayward, MThe 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 Cr(4+)O6 units. Typically materials containing networks of octahedrally coordinated Cr(4+) 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 Cr(4+) oxide phases are discussed. |
| spellingShingle | Zhang, R Read, G Lang, F Lancaster, T Blundell, S Hayward, M La2SrCr2O7F2: A Ruddlesden-Popper oxyfluoride containing octahedrally coordinated Cr(4+) centers |
| title | La2SrCr2O7F2: A Ruddlesden-Popper oxyfluoride containing octahedrally coordinated Cr(4+) centers |
| title_full | La2SrCr2O7F2: A Ruddlesden-Popper oxyfluoride containing octahedrally coordinated Cr(4+) centers |
| title_fullStr | La2SrCr2O7F2: A Ruddlesden-Popper oxyfluoride containing octahedrally coordinated Cr(4+) centers |
| title_full_unstemmed | La2SrCr2O7F2: A Ruddlesden-Popper oxyfluoride containing octahedrally coordinated Cr(4+) centers |
| title_short | La2SrCr2O7F2: A Ruddlesden-Popper oxyfluoride containing octahedrally coordinated Cr(4+) centers |
| title_sort | la2srcr2o7f2 a ruddlesden popper oxyfluoride containing octahedrally coordinated cr 4 centers |
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