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Structural phase transitions and crystal chemistry of the series Ba2LnBâ?²O6 (Ln=lanthanide and Bâ?²=Nb5+ or Sb5+)

Saines, P.J., Kennedy, B.J., Elcombe, M.M. (2007) Structural phase transitions and crystal chemistry of the series Ba2LnBâ?²O6 (Ln=lanthanide and Bâ?²=Nb5+ or Sb5+). Journal of Solid State Chemistry, 180 (2). pp. 401-409. ISSN 00224596 (ISSN). (doi:10.1016/j.jssc.2006.10.017) (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 28 compounds in the two series Ba2LnSbO6 and Ba2LnNbO6 have been examined using synchrotron X-ray and in selected cases neutron powder diffraction at, below and above ambient temperature. The antimonate series is found to undergo a sequence of phase transitions from monoclinic to rhombohedral to cubic symmetry with both decreasing ionic radii of the lanthanides and increasing temperature. Compounds in the series Ba2LnNbO6, on the other hand, feature an intermediate tetragonal structure instead of the rhombohedral structure exhibited by the antimonates. This difference in symmetry is thought to be caused by Ï?-bonding in the niobates that is absent in the antimonates. The bonding environments of the cations in these compounds have also been examined with overbonding of the lanthanide and niobium cations being caused by the unusually large B-site cations. © 2006 Elsevier Inc. All rights reserved.

Item Type: Article
DOI/Identification number: 10.1016/j.jssc.2006.10.017
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] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: Crystal structure, Metal oxides, Perovskite, Phase transitions, Crystal structure, Niobium compounds, Perovskite, Phase transitions, Positive ions, Rare earth elements, Antimonate series, Crystal chemistry, Metal oxides, Neutron powder diffraction, Barium compounds
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 10:26 UTC
Last Modified: 29 May 2019 16:04 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/50745 (The current URI for this page, for reference purposes)
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