Structural characterisation of the perovskite series SrxCa1-x-yNdyMnO3: Influence of the Jahn-Teller effect

Kennedy, B.J., Saines, P.J., Ting, J., Zhou, Q., Kimpton, J.A. (2009) Structural characterisation of the perovskite series SrxCa1-x-yNdyMnO3: Influence of the Jahn-Teller effect. Journal of Solid State Chemistry, 182 (10). pp. 2858-2866. ISSN 00224596 (ISSN). (doi:10.1016/j.jssc.2009.07.041) (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 crystal structures of the perovskite manganites SrxCa1-x-yNdyMnO3 with y=0.1 or 0.2 have been investigated using synchrotron X-ray powder diffraction. At room temperature the structures change from Pm over(3, -) m â?? I 4 / mcm â?? Pbnm depending on the cation distribution, the different structures exhibiting different tilts of the MnO6 octahedra. High temperature diffraction measurements demonstrate the presence of, an apparently continuous, isosymmetric I4/mcm to I4/mcm phase transition associated with the removal of long range orbital ordering. Heating the manganites to still higher temperatures results in a continuous transition to the cubic Pm over(3, -) m structure. A feature of such transitions is the continuous evolution of the octahedral tilt angle through the I4/mcm to I4/mcm phase transition. The orthorhombic structures do not exhibit orbital ordering and although a first order transition to the tetragonal structure is observed in Sr0.4Ca0.5Nd0.1MnO3, this high temperature tetragonal structure does not exhibit orbital ordering. © 2009 Elsevier Inc. All rights reserved.

Item Type: Article
DOI/Identification number: 10.1016/j.jssc.2009.07.041
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, NSW 2006, Australia [Field not mapped to EPrints] AD - Australian Synchrotron, 800 Blackburn Road, Clayton, Vic. 3168, Australia [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Uncontrolled keywords: Isosymmetric phase transition, Manganites, Perovskite, Structural phase transition, Cation distributions, Characterisation, Continuous transitions, Different structure, First order transitions, High temperature, High temperature diffraction, Higher temperatures, Isosymmetric phase transition, Jahn Teller effect, Long range, Orbital ordering, Orthorhombic structures, Perovskite manganites, Room temperature, Structural phase transition, Synchrotron X ray powder diffraction, Tetragonal structure, Tilt angle, Calcium, Diffraction, Manganese compounds, Neodymium, Oxide minerals, Perovskite, X ray powder diffraction, Phase transitions
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 10:12 UTC
Last Modified: 29 May 2019 16:04 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/50733 (The current URI for this page, for reference purposes)
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