Phase segregation in mixed Nb-Sb double perovskites Ba2LnNb1-xSbxO6

Saines, P.J. and Kennedy, B.J. (2008) Phase segregation in mixed Nb-Sb double perovskites Ba2LnNb1-xSbxO6. Journal of Solid State Chemistry, 181 (2). pp. 298-305. ISSN 00224596 (ISSN). (doi:https://doi.org/10.1016/j.jssc.2007.11.035) (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 phase composition of two series of mixed Nb5+-Sb5+ double perovskites formed between the pairs Ba2EuNbO6-Ba2PrSbO6 and Ba2NdSbO6-Ba2NdNbO6 have been studied using synchrotron X-ray powder diffraction methods. In both series extensive phase segregation is observed demonstrating limited solubility of Sb5+ in these Nb5+ perovskites, irrespective of the precise structures of the double perovskite. Evidence for a monoclinic I2/m phase in the series formed between tetragonal I4/m Ba2EuNbO6 and rhombohedral R over(3, -) Ba2EuNbO6 is presented. It is postulated that this phase segregation is a consequence of competing bonding requirements of the Nb5+ and Sb5+ cations associated with their electronic configurations. © 2007 Elsevier Inc. All rights reserved.

Item Type: Article
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] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: Perovskite, Phase segregation, Rietveld refinement, Barium compounds, Chemical bonds, Phase composition, Solubility, Synchrotrons, X ray powder diffraction, Electronic configurations, Phase segregation, Perovskite
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 10:21 UTC
Last Modified: 07 Oct 2015 10:21 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/50741 (The current URI for this page, for reference purposes)
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