Phase and valence transitions in Ba2LnSnxSb1-xO6-δ (Ln=Pr and Tb)
Compounds in the double perovskites series Ba2LnSnxSb1-xO6-δ (Ln=Pr and Tb) have been synthesised and structurally characterised using synchrotron X-ray and neutron powder diffraction. It was found that the two end-members of the Ba2PrSnxSb1-xO6-δ series both adopt rhombohedral symmetry but the anti...
| Hoofdauteurs: | , , , , , |
|---|---|
| Formaat: | Journal article |
| Taal: | English |
| Gepubliceerd in: |
2008
|
| _version_ | 1826288761530482688 |
|---|---|
| author | Saines, P Kennedy, B Elcombe, M Harris, H Jang, L Zhang, Z |
| author_facet | Saines, P Kennedy, B Elcombe, M Harris, H Jang, L Zhang, Z |
| author_sort | Saines, P |
| collection | OXFORD |
| description | Compounds in the double perovskites series Ba2LnSnxSb1-xO6-δ (Ln=Pr and Tb) have been synthesised and structurally characterised using synchrotron X-ray and neutron powder diffraction. It was found that the two end-members of the Ba2PrSnxSb1-xO6-δ series both adopt rhombohedral symmetry but the antimonate is a fully ordered double perovskite while the stannate has no B-site cation ordering. X-ray absorption near-edge structure (XANES) and near-infrared spectroscopy indicate that the Pr cations gradually change oxidation state from Pr3+ to Pr4+ with increasing x and that this is likely to be the cause of the loss of B-site ordering. Similarly, both Ba2TbSbO6 and Ba2TbSnO6-δ are cubic with B-site ordering present in the former but absent in the latter due to the oxidation state change of the Tb from Tb3+ to Tb4+. Multiple linear regression analysis of the Pr and Tb LIII-edge XANES indicates that the rate of Ln3+ transforming to Ln4+ is such that there are no oxygen vacancies in Ba2PrSnxSb1-xO6-δ but in Ba2TbSnxSb1-xO6-δ there is a small amount of oxygen vacancies, with a maximum of δ≈0.05 present. Crown Copyright © 2008. |
| first_indexed | 2024-03-07T02:18:35Z |
| format | Journal article |
| id | oxford-uuid:a31db78c-0c6e-46e8-9d17-f177058d653f |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T02:18:35Z |
| publishDate | 2008 |
| record_format | dspace |
| spelling | oxford-uuid:a31db78c-0c6e-46e8-9d17-f177058d653f2022-03-27T02:24:40ZPhase and valence transitions in Ba2LnSnxSb1-xO6-δ (Ln=Pr and Tb)Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:a31db78c-0c6e-46e8-9d17-f177058d653fEnglishSymplectic Elements at Oxford2008Saines, PKennedy, BElcombe, MHarris, HJang, LZhang, ZCompounds in the double perovskites series Ba2LnSnxSb1-xO6-δ (Ln=Pr and Tb) have been synthesised and structurally characterised using synchrotron X-ray and neutron powder diffraction. It was found that the two end-members of the Ba2PrSnxSb1-xO6-δ series both adopt rhombohedral symmetry but the antimonate is a fully ordered double perovskite while the stannate has no B-site cation ordering. X-ray absorption near-edge structure (XANES) and near-infrared spectroscopy indicate that the Pr cations gradually change oxidation state from Pr3+ to Pr4+ with increasing x and that this is likely to be the cause of the loss of B-site ordering. Similarly, both Ba2TbSbO6 and Ba2TbSnO6-δ are cubic with B-site ordering present in the former but absent in the latter due to the oxidation state change of the Tb from Tb3+ to Tb4+. Multiple linear regression analysis of the Pr and Tb LIII-edge XANES indicates that the rate of Ln3+ transforming to Ln4+ is such that there are no oxygen vacancies in Ba2PrSnxSb1-xO6-δ but in Ba2TbSnxSb1-xO6-δ there is a small amount of oxygen vacancies, with a maximum of δ≈0.05 present. Crown Copyright © 2008. |
| spellingShingle | Saines, P Kennedy, B Elcombe, M Harris, H Jang, L Zhang, Z Phase and valence transitions in Ba2LnSnxSb1-xO6-δ (Ln=Pr and Tb) |
| title | Phase and valence transitions in Ba2LnSnxSb1-xO6-δ (Ln=Pr and Tb) |
| title_full | Phase and valence transitions in Ba2LnSnxSb1-xO6-δ (Ln=Pr and Tb) |
| title_fullStr | Phase and valence transitions in Ba2LnSnxSb1-xO6-δ (Ln=Pr and Tb) |
| title_full_unstemmed | Phase and valence transitions in Ba2LnSnxSb1-xO6-δ (Ln=Pr and Tb) |
| title_short | Phase and valence transitions in Ba2LnSnxSb1-xO6-δ (Ln=Pr and Tb) |
| title_sort | phase and valence transitions in ba2lnsnxsb1 xo6 δ ln pr and tb |
| work_keys_str_mv | AT sainesp phaseandvalencetransitionsinba2lnsnxsb1xo6dlnprandtb AT kennedyb phaseandvalencetransitionsinba2lnsnxsb1xo6dlnprandtb AT elcombem phaseandvalencetransitionsinba2lnsnxsb1xo6dlnprandtb AT harrish phaseandvalencetransitionsinba2lnsnxsb1xo6dlnprandtb AT jangl phaseandvalencetransitionsinba2lnsnxsb1xo6dlnprandtb AT zhangz phaseandvalencetransitionsinba2lnsnxsb1xo6dlnprandtb |