15R SrMn1-xFexO3-δ (x ≈ 0.1); A New Perovskite Stacking Sequence
A polycrystalline sample of a new phase in the Sr-Fe-Mn-O system has been prepared by standard solid-state techniques. Characterization at room temperature by X-ray diffraction, high-resolution electron microscopy, Mössbauer spectroscopy and neutron diffraction has led to it being described as a 15-...
| Main Authors: | , , , , |
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| Format: | Journal article |
| Language: | English |
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1998
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| _version_ | 1797102721855127552 |
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| author | Cussen, E Sloan, J Vente, J Battle, P Gibb, T |
| author_facet | Cussen, E Sloan, J Vente, J Battle, P Gibb, T |
| author_sort | Cussen, E |
| collection | OXFORD |
| description | A polycrystalline sample of a new phase in the Sr-Fe-Mn-O system has been prepared by standard solid-state techniques. Characterization at room temperature by X-ray diffraction, high-resolution electron microscopy, Mössbauer spectroscopy and neutron diffraction has led to it being described as a 15-layered, rhombohedral (15R) perovskite [space group R3̄m: a = 5.4489(1) Å, c = 33,8036(7) Å] with a previously unobserved structure. The pseudo close-packed SrO3 layers have a (cchch)3, stacking sequence such that the occupation of the interstitial 6-coordinate sites by Mn (or Fe) leads to the formation of Mn2O9 units which are linked to each other either directly by a common vertex, or indirectly via a single, vertex-sharing MnO6 octahedron. The stoichiometry of the compound was determined to be SrMn0.915(5)Fe0.085(5)O2.979(3). The face-sharing sites are occupied by 0.957(3)Mn/0.043(3)Fe while the exclusively corner-linked sites show a higher Fe occupation; 0.745(4)Mn/0.255(4)Fe. A neutron diffraction experiment carried out at 3 K indicated the presence of long-range magnetic order with the Mn4+ cations aligned antiferromagnetically with an ordered moment of 2.26(3)/μB/Mn4+. Both the neutron and the susceptibility data are consistent with the Fe cations remaining magnetically disordered to 3 K. The latter data show TN = 220 K, and suggest that some spin frustration is present at low temperatures. |
| first_indexed | 2024-03-07T06:09:49Z |
| format | Journal article |
| id | oxford-uuid:ef171d59-1ea5-466b-8267-99bf0d8c7277 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T06:09:49Z |
| publishDate | 1998 |
| record_format | dspace |
| spelling | oxford-uuid:ef171d59-1ea5-466b-8267-99bf0d8c72772022-03-27T11:37:47Z15R SrMn1-xFexO3-δ (x ≈ 0.1); A New Perovskite Stacking SequenceJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:ef171d59-1ea5-466b-8267-99bf0d8c7277EnglishSymplectic Elements at Oxford1998Cussen, ESloan, JVente, JBattle, PGibb, TA polycrystalline sample of a new phase in the Sr-Fe-Mn-O system has been prepared by standard solid-state techniques. Characterization at room temperature by X-ray diffraction, high-resolution electron microscopy, Mössbauer spectroscopy and neutron diffraction has led to it being described as a 15-layered, rhombohedral (15R) perovskite [space group R3̄m: a = 5.4489(1) Å, c = 33,8036(7) Å] with a previously unobserved structure. The pseudo close-packed SrO3 layers have a (cchch)3, stacking sequence such that the occupation of the interstitial 6-coordinate sites by Mn (or Fe) leads to the formation of Mn2O9 units which are linked to each other either directly by a common vertex, or indirectly via a single, vertex-sharing MnO6 octahedron. The stoichiometry of the compound was determined to be SrMn0.915(5)Fe0.085(5)O2.979(3). The face-sharing sites are occupied by 0.957(3)Mn/0.043(3)Fe while the exclusively corner-linked sites show a higher Fe occupation; 0.745(4)Mn/0.255(4)Fe. A neutron diffraction experiment carried out at 3 K indicated the presence of long-range magnetic order with the Mn4+ cations aligned antiferromagnetically with an ordered moment of 2.26(3)/μB/Mn4+. Both the neutron and the susceptibility data are consistent with the Fe cations remaining magnetically disordered to 3 K. The latter data show TN = 220 K, and suggest that some spin frustration is present at low temperatures. |
| spellingShingle | Cussen, E Sloan, J Vente, J Battle, P Gibb, T 15R SrMn1-xFexO3-δ (x ≈ 0.1); A New Perovskite Stacking Sequence |
| title | 15R SrMn1-xFexO3-δ (x ≈ 0.1); A New Perovskite Stacking Sequence |
| title_full | 15R SrMn1-xFexO3-δ (x ≈ 0.1); A New Perovskite Stacking Sequence |
| title_fullStr | 15R SrMn1-xFexO3-δ (x ≈ 0.1); A New Perovskite Stacking Sequence |
| title_full_unstemmed | 15R SrMn1-xFexO3-δ (x ≈ 0.1); A New Perovskite Stacking Sequence |
| title_short | 15R SrMn1-xFexO3-δ (x ≈ 0.1); A New Perovskite Stacking Sequence |
| title_sort | 15r srmn1 xfexo3 δ x ≈ 0 1 a new perovskite stacking sequence |
| work_keys_str_mv | AT cussene 15rsrmn1xfexo3dx01anewperovskitestackingsequence AT sloanj 15rsrmn1xfexo3dx01anewperovskitestackingsequence AT ventej 15rsrmn1xfexo3dx01anewperovskitestackingsequence AT battlep 15rsrmn1xfexo3dx01anewperovskitestackingsequence AT gibbt 15rsrmn1xfexo3dx01anewperovskitestackingsequence |