Phase and valence transitions in Ba2LnSnxSb1-xO6-δ (Ln=Pr and Tb)

Saines, P.J., Kennedy, B.J., Elcombe, M.M., Harris, H.H., Jang, L.-Y., Zhang, Z. (2008) Phase and valence transitions in Ba2LnSnxSb1-xO6-δ (Ln=Pr and Tb). Journal of Solid State Chemistry, 181 (11). pp. 2941-2952. ISSN 00224596 (ISSN). (doi:10.1016/j.jssc.2008.07.007) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
https://doi.org/10.1016/j.jssc.2008.07.007

Abstract

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 δâ??0.05 present. Crown Copyright © 2008.

Item Type: Article
DOI/Identification number: 10.1016/j.jssc.2008.07.007
Additional information: Unmapped bibliographic data: LA - English [Field not mapped to EPrints] J2 - J. Solid State Chem. [Field not mapped to EPrints] AD - School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia [Field not mapped to EPrints] AD - Bragg Institute, ANSTO, Private Mail Bag 1, Menai, NSW 2234, Australia [Field not mapped to EPrints] AD - School of Chemistry and Physics, The University of Adelaide, Adelaide, SA 5005, Australia [Field not mapped to EPrints] AD - Research Division, National Synchrotron Radiation Research Center, Hsinchu, 300, Taiwan [Field not mapped to EPrints] AD - Institute of Materials Engineering, ANSTO, Private Mail Bag 1, Menai, NSW 2234, Australia [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: Lanthanide valence state, Oxygen vacancies, Perovskite, Structural phase transition, XANES
Subjects: Q Science > QC Physics > QC173.45 Condensed Matter
Q Science > QD Chemistry > QD478 Solid State Chemistry
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Paul Saines
Date Deposited: 07 Oct 2015 10:16 UTC
Last Modified: 29 May 2019 16:04 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/50736 (The current URI for this page, for reference purposes)
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