Structures and crystal chemistry of the double perovskites Ba2LnBâ?²O6 (Ln=lanthanide Bâ?²=Nb5+ and Ta5+): Part I. Investigation of Ba2LnTaO6 using synchrotron X-ray and neutron powder diffraction

Saines, P.J., Spencer, J.R., Kennedy, B.J., Avdeev, M. (2007) Structures and crystal chemistry of the double perovskites Ba2LnBâ?²O6 (Ln=lanthanide Bâ?²=Nb5+ and Ta5+): Part I. Investigation of Ba2LnTaO6 using synchrotron X-ray and neutron powder diffraction. Journal of Solid State Chemistry, 180 (11). pp. 2991-3000. ISSN 00224596 (ISSN). (doi:10.1016/j.jssc.2007.08.009) (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 structure of 14 compounds in the series Ba2LnTaO6 have been examined using synchrotron X-ray diffraction and found to undergo a sequence of phase transitions from I2/m monoclinic to I4/m tetragonal to Fm over(3, -) m cubic symmetry with decreasing ionic radii of the lanthanides. Ba2LaTaO6 is an exception to this with variable temperature neutron diffraction being used to establish that the full series of phases adopted over the range of 15-500 K is P21/n monoclinic to I2/m monoclinic to R over(3, -) rhombohedral. The chemical environments of these compounds have also been investigated and the overbonding to the lanthanide cations is due to the unusually large size for the B-site in these perovskites. © 2007 Elsevier Inc. All rights reserved.

Item Type: Article
DOI/Identification number: 10.1016/j.jssc.2007.08.009
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: Neutron powder diffraction, Perovskite, Phase transition, Synchrotron X-ray powder diffraction, Barium compounds, Chemical bonds, Neutron powder diffraction, Phase transitions, X ray powder diffraction, Ionic radii, Lanthanide cations, Synchrotron X-ray powder diffraction, Temperature neutron diffraction, 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 10:25 UTC
Last Modified: 29 May 2019 16:04 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/50744 (The current URI for this page, for reference purposes)
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