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Structures and crystal chemistry of the double perovskites Ba2LnBâ?²O6 (Ln=lanthanide and Bâ?²=Nb, Ta):. Part II-Temperature dependence of the structures of Ba2LnBâ?²O6

Saines, P.J., Spencer, J.R., Kennedy, B.J., Kubota, Y., Minakata, C., Hano, H., Kato, K., Takata, M. (2007) Structures and crystal chemistry of the double perovskites Ba2LnBâ?²O6 (Ln=lanthanide and Bâ?²=Nb, Ta):. Part II-Temperature dependence of the structures of Ba2LnBâ?²O6. Journal of Solid State Chemistry, 180 (11). pp. 3001-3007. ISSN 00224596 (ISSN). (doi:10.1016/j.jssc.2007.08.010) (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 eight members of the series of double perovskites of the type Ba2LnB�O6 (Ln=La3+-Sm3+ and Y3+ and B�=Nb5+ and Ta5+) were examined both above and below room temperature using synchrotron X-ray powder diffraction. The La3+ and Pr3+ containing compounds had an intermediate rhombohedral phase whereas the other tantalates and niobates studied have a tetragonal intermediate. This difference in symmetry appears to be a consequence of the larger size of the La3+ and Pr3+ cations compared to the other lanthanides. The temperature range over which the intermediate symmetry is stable is reduced in those compounds near the point where the preferred intermediate symmetry changes from tetragonal to rhombohedral. In such compounds the transition to the cubic phase involves higher order terms in the Landau expression. This suggests that in this region the stability of the two intermediate phases is similar. © 2007 Elsevier Inc. All rights reserved.

Item Type: Article
DOI/Identification number: 10.1016/j.jssc.2007.08.010
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 - Department of Physical Science, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan [Field not mapped to EPrints] AD - RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo, 679-5148, Japan [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, Crystal chemistry, Neutron powder diffraction, Phase transitions, Rare earth elements, X ray powder diffraction, Intermediate symmetry, Rhombohedral phase, Synchrotron X-ray powder 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 10:23 UTC
Last Modified: 29 May 2019 16:04 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/50743 (The current URI for this page, for reference purposes)
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