Phase and valence transitions in Ba2LnSnxNb1-xO6-δ

Saines, P.J., Kennedy, B.J., Johannessen, B., Poulton, S. (2008) Phase and valence transitions in Ba2LnSnxNb1-xO6-δ. Journal of Solid State Chemistry, 181 (11). pp. 2994-3004. ISSN 00224596 (ISSN). (doi:10.1016/j.jssc.2008.07.021) (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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Abstract

The structures of compounds in the perovskite series Ba2LnSnxNb1-xO6-δ (Ln=Pr and Tb and x=0, 0.1, 0.2, ..., 1.0) have been examined using synchrotron X-ray and neutron diffraction. It was found that niobate members of both series feature full B-site cation ordering but that this order is lost with increasing x. X-ray absorption near-edge structure (XANES) and near-infrared spectroscopies indicate that the oxidation state of the lanthanide cations gradually changes from Ln3+ to Ln4+ with increased Sn4+ doping. This is believed to be the cause of the loss of B-site ordering. Least squares analysis of the XANES spectra suggests that the rate of the transformation of Ln3+ cations to the tetravalent state is such that the Pr series contains no oxygen vacancies while the Tb series may contain a very small amount of vacancies, with δâ??0.02. © 2008 Elsevier Inc. All rights reserved.

Item Type: Article
DOI/Identification number: 10.1016/j.jssc.2008.07.021
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 - Australian Nuclear Science and Technology Organization, Menai, NSW 2234, Australia [Field not mapped to EPrints] AD - NIST Center for Neutron Research, 100 Bureau Drive, Gaithersburg, MD 20899-6102, United States [Field not mapped to EPrints] AD - Department of Materials and Engineering, University of Maryland, College Park, MD 20742, United States [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: Perovskite, Phase transition, Valence state, 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 10:17 UTC
Last Modified: 29 May 2019 16:04 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/50737 (The current URI for this page, for reference purposes)
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