Structure and magnetism of Sr3Co2O4Cl2--an electronically driven lattice distortion in an oxychloride containing square planar Co(II) centers.
Topochemical reduction of Sr(3)Co(2)O(5)Cl(2) with NaH at 200 °C yields Sr(3)Co(2)O(4)Cl(2), a phase consisting of infinite double sheets of corner-linked Co(II)O(4) square planes stacked with SrCl rocksalt layers. At 298 K, the structure of Sr(3)Co(2)O(4)Cl(2) is described in the tetragonal space g...
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| Format: | Journal article |
| Language: | English |
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2012
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| _version_ | 1797053848368447488 |
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| author | Romero, F Coyle, L Hayward, M |
| author_facet | Romero, F Coyle, L Hayward, M |
| author_sort | Romero, F |
| collection | OXFORD |
| description | Topochemical reduction of Sr(3)Co(2)O(5)Cl(2) with NaH at 200 °C yields Sr(3)Co(2)O(4)Cl(2), a phase consisting of infinite double sheets of corner-linked Co(II)O(4) square planes stacked with SrCl rocksalt layers. At 298 K, the structure of Sr(3)Co(2)O(4)Cl(2) is described in the tetragonal space group I4/mmm [a = 4.007(1) Å, c = 22.282(1) Å]; however, on cooling below 200 K, the structure undergoes a lattice distortion to adopt a structure with orthorhombic symmetry in space group Immm [a = 3.9757(5) Å, b = 4.0294(5) Å, and c = 22.147(3) Å at 5 K]. The structural distortion can be considered Jahn-Teller-like as it lifts the orbital degeneracy of the square planar, d(7), Co(II) centers, demonstrating a strong coupling between the electronic configuration and the structural lattice of this oxychloride phase. On cooling below 50 K, Sr(3)Co(2)O(4)Cl(2) adopts a canted antiferromagnetically ordered state. All magnetization data show that the local cobalt moment is much greater than would be expected for a simple spin-only S = 3/2 center, indicating a strong orbital contribution to the magnetic behavior. |
| first_indexed | 2024-03-06T18:49:17Z |
| format | Journal article |
| id | oxford-uuid:0fa1aba8-9662-4925-9c84-dd21e36ae8a3 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T18:49:17Z |
| publishDate | 2012 |
| record_format | dspace |
| spelling | oxford-uuid:0fa1aba8-9662-4925-9c84-dd21e36ae8a32022-03-26T09:52:16ZStructure and magnetism of Sr3Co2O4Cl2--an electronically driven lattice distortion in an oxychloride containing square planar Co(II) centers.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:0fa1aba8-9662-4925-9c84-dd21e36ae8a3EnglishSymplectic Elements at Oxford2012Romero, FCoyle, LHayward, MTopochemical reduction of Sr(3)Co(2)O(5)Cl(2) with NaH at 200 °C yields Sr(3)Co(2)O(4)Cl(2), a phase consisting of infinite double sheets of corner-linked Co(II)O(4) square planes stacked with SrCl rocksalt layers. At 298 K, the structure of Sr(3)Co(2)O(4)Cl(2) is described in the tetragonal space group I4/mmm [a = 4.007(1) Å, c = 22.282(1) Å]; however, on cooling below 200 K, the structure undergoes a lattice distortion to adopt a structure with orthorhombic symmetry in space group Immm [a = 3.9757(5) Å, b = 4.0294(5) Å, and c = 22.147(3) Å at 5 K]. The structural distortion can be considered Jahn-Teller-like as it lifts the orbital degeneracy of the square planar, d(7), Co(II) centers, demonstrating a strong coupling between the electronic configuration and the structural lattice of this oxychloride phase. On cooling below 50 K, Sr(3)Co(2)O(4)Cl(2) adopts a canted antiferromagnetically ordered state. All magnetization data show that the local cobalt moment is much greater than would be expected for a simple spin-only S = 3/2 center, indicating a strong orbital contribution to the magnetic behavior. |
| spellingShingle | Romero, F Coyle, L Hayward, M Structure and magnetism of Sr3Co2O4Cl2--an electronically driven lattice distortion in an oxychloride containing square planar Co(II) centers. |
| title | Structure and magnetism of Sr3Co2O4Cl2--an electronically driven lattice distortion in an oxychloride containing square planar Co(II) centers. |
| title_full | Structure and magnetism of Sr3Co2O4Cl2--an electronically driven lattice distortion in an oxychloride containing square planar Co(II) centers. |
| title_fullStr | Structure and magnetism of Sr3Co2O4Cl2--an electronically driven lattice distortion in an oxychloride containing square planar Co(II) centers. |
| title_full_unstemmed | Structure and magnetism of Sr3Co2O4Cl2--an electronically driven lattice distortion in an oxychloride containing square planar Co(II) centers. |
| title_short | Structure and magnetism of Sr3Co2O4Cl2--an electronically driven lattice distortion in an oxychloride containing square planar Co(II) centers. |
| title_sort | structure and magnetism of sr3co2o4cl2 an electronically driven lattice distortion in an oxychloride containing square planar co ii centers |
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