15R SrMn(1-)(x)()Fe(x)()O(3)(-)(delta) (x approximately 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-...
| Hlavní autoři: | , , , , |
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| Médium: | Journal article |
| Jazyk: | English |
| Vydáno: |
1998
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| _version_ | 1826265772938231808 |
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| author | Cussen, E Sloan, J Sloan, J Vente, J Vente, J Battle, P Battle, P Gibb, T Gibb, T |
| author_facet | Cussen, E Sloan, J Sloan, J Vente, J Vente, J Battle, P Battle, P Gibb, T 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 Randthremacr;m: a = 5.4489(1) Å, c = 33.8036(7) Å] with a previously unobserved structure. The pseudo close-packed SrO(3) 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 Mn(2)O(9) units which are linked to each other either directly by a common vertex, or indirectly via a single, vertex-sharing MnO(6) octahedron. The stoichiometry of the compound was determined to be SrMn(0.915(5))Fe(0.085(5))O(2.979(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 Mn(4+) cations aligned antiferromagnetically with an ordered moment of 2.26(3)andmgr;(B)/Mn(4+). Both the neutron and the susceptibility data are consistent with the Fe cations remaining magnetically disordered to 3 K. The latter data show T(N) = 220 K, and suggest that some spin frustration is present at low temperatures. |
| first_indexed | 2024-03-06T20:28:53Z |
| format | Journal article |
| id | oxford-uuid:30613a2c-9270-47fa-84d5-c33c6e3f7444 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T20:28:53Z |
| publishDate | 1998 |
| record_format | dspace |
| spelling | oxford-uuid:30613a2c-9270-47fa-84d5-c33c6e3f74442022-03-26T13:01:06Z15R SrMn(1-)(x)()Fe(x)()O(3)(-)(delta) (x approximately 0.1); A New Perovskite Stacking Sequence.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:30613a2c-9270-47fa-84d5-c33c6e3f7444EnglishSymplectic Elements at Oxford1998Cussen, ESloan, JSloan, JVente, JVente, JBattle, PBattle, PGibb, TGibb, 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 Randthremacr;m: a = 5.4489(1) Å, c = 33.8036(7) Å] with a previously unobserved structure. The pseudo close-packed SrO(3) 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 Mn(2)O(9) units which are linked to each other either directly by a common vertex, or indirectly via a single, vertex-sharing MnO(6) octahedron. The stoichiometry of the compound was determined to be SrMn(0.915(5))Fe(0.085(5))O(2.979(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 Mn(4+) cations aligned antiferromagnetically with an ordered moment of 2.26(3)andmgr;(B)/Mn(4+). Both the neutron and the susceptibility data are consistent with the Fe cations remaining magnetically disordered to 3 K. The latter data show T(N) = 220 K, and suggest that some spin frustration is present at low temperatures. |
| spellingShingle | Cussen, E Sloan, J Sloan, J Vente, J Vente, J Battle, P Battle, P Gibb, T Gibb, T 15R SrMn(1-)(x)()Fe(x)()O(3)(-)(delta) (x approximately 0.1); A New Perovskite Stacking Sequence. |
| title | 15R SrMn(1-)(x)()Fe(x)()O(3)(-)(delta) (x approximately 0.1); A New Perovskite Stacking Sequence. |
| title_full | 15R SrMn(1-)(x)()Fe(x)()O(3)(-)(delta) (x approximately 0.1); A New Perovskite Stacking Sequence. |
| title_fullStr | 15R SrMn(1-)(x)()Fe(x)()O(3)(-)(delta) (x approximately 0.1); A New Perovskite Stacking Sequence. |
| title_full_unstemmed | 15R SrMn(1-)(x)()Fe(x)()O(3)(-)(delta) (x approximately 0.1); A New Perovskite Stacking Sequence. |
| title_short | 15R SrMn(1-)(x)()Fe(x)()O(3)(-)(delta) (x approximately 0.1); A New Perovskite Stacking Sequence. |
| title_sort | 15r srmn 1 x fe x o 3 delta x approximately 0 1 a new perovskite stacking sequence |
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