Sr1.8Nd1.2Mn2O7: Synthesis, crystal structure, and physical properties
A detailed investigation into the preparation of powder samples of the n = 2 Ruddlesden-Popper (RP) oxide Sr1.8Nd1.2Mn2O7 is presented. This material is of interest as it displays colossal magntoresistance (CMR) without three-dimensional ferromagnetic long-range order. It is shown that Rietveld refi...
| Main Authors: | , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
1997
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| _version_ | 1797090859891556352 |
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| author | Battle, P Hepburn, J Millburn, J Radaelli, P Rosseinsky, M Spring, L Vente, J |
| author_facet | Battle, P Hepburn, J Millburn, J Radaelli, P Rosseinsky, M Spring, L Vente, J |
| author_sort | Battle, P |
| collection | OXFORD |
| description | A detailed investigation into the preparation of powder samples of the n = 2 Ruddlesden-Popper (RP) oxide Sr1.8Nd1.2Mn2O7 is presented. This material is of interest as it displays colossal magntoresistance (CMR) without three-dimensional ferromagnetic long-range order. It is shown that Rietveld refinement of high-resolution powder X-ray and neutron diffraction data is essential to assess the outcomes of syntheses because of the potential coexistence of two very similar Ruddlesden-Popper phases. Phase coexistence or significant temperature-dependent anisotropic strain can be indicated by the broadening of the {0 0 10} reflection at 5 K. This suggests that a more subtle form of the previously reported phase separation at x = 0 is also difficult to avoid at the x = 0.2 composition. Precise attention to reaction temperature and time is required to prepare samples containing only one n = 2 Ruddlesden-Popper phase, and contamination by small quantities of the n = ∞ perovskite is a pervasive problem. Neutron powder diffraction structural analysis of the highest quality sample allows a comparison with the three-dimensional ferromagnet Sr1.8La1.2Mn2O7. The structure suggests that only slight changes in the Mn-O bond lengths are required to radically alter the electronic structure of n = 2 Ruddlesden-Popper phases. |
| first_indexed | 2024-03-07T03:24:46Z |
| format | Journal article |
| id | oxford-uuid:b8aa579f-ca7c-4e19-a06d-c3ebde3fddef |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T03:24:46Z |
| publishDate | 1997 |
| record_format | dspace |
| spelling | oxford-uuid:b8aa579f-ca7c-4e19-a06d-c3ebde3fddef2022-03-27T04:57:29ZSr1.8Nd1.2Mn2O7: Synthesis, crystal structure, and physical propertiesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:b8aa579f-ca7c-4e19-a06d-c3ebde3fddefEnglishSymplectic Elements at Oxford1997Battle, PHepburn, JMillburn, JRadaelli, PRosseinsky, MSpring, LVente, JA detailed investigation into the preparation of powder samples of the n = 2 Ruddlesden-Popper (RP) oxide Sr1.8Nd1.2Mn2O7 is presented. This material is of interest as it displays colossal magntoresistance (CMR) without three-dimensional ferromagnetic long-range order. It is shown that Rietveld refinement of high-resolution powder X-ray and neutron diffraction data is essential to assess the outcomes of syntheses because of the potential coexistence of two very similar Ruddlesden-Popper phases. Phase coexistence or significant temperature-dependent anisotropic strain can be indicated by the broadening of the {0 0 10} reflection at 5 K. This suggests that a more subtle form of the previously reported phase separation at x = 0 is also difficult to avoid at the x = 0.2 composition. Precise attention to reaction temperature and time is required to prepare samples containing only one n = 2 Ruddlesden-Popper phase, and contamination by small quantities of the n = ∞ perovskite is a pervasive problem. Neutron powder diffraction structural analysis of the highest quality sample allows a comparison with the three-dimensional ferromagnet Sr1.8La1.2Mn2O7. The structure suggests that only slight changes in the Mn-O bond lengths are required to radically alter the electronic structure of n = 2 Ruddlesden-Popper phases. |
| spellingShingle | Battle, P Hepburn, J Millburn, J Radaelli, P Rosseinsky, M Spring, L Vente, J Sr1.8Nd1.2Mn2O7: Synthesis, crystal structure, and physical properties |
| title | Sr1.8Nd1.2Mn2O7: Synthesis, crystal structure, and physical properties |
| title_full | Sr1.8Nd1.2Mn2O7: Synthesis, crystal structure, and physical properties |
| title_fullStr | Sr1.8Nd1.2Mn2O7: Synthesis, crystal structure, and physical properties |
| title_full_unstemmed | Sr1.8Nd1.2Mn2O7: Synthesis, crystal structure, and physical properties |
| title_short | Sr1.8Nd1.2Mn2O7: Synthesis, crystal structure, and physical properties |
| title_sort | sr1 8nd1 2mn2o7 synthesis crystal structure and physical properties |
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