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Layered Ruddlesden-Popper Manganese Oxides: Synthesis and Cation Ordering

Battle, P.D., Green, M.A., Laskey, N.S., Millburn, J.E., Murphy, L., Rosseinsky, M.J., Sullivan, S.P., Vente, J.F. (1997) Layered Ruddlesden-Popper Manganese Oxides: Synthesis and Cation Ordering. Chemistry of Materials, 9 (2). pp. 552-559. ISSN 0897-4756. (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 preparation and crystal structures of the n = 2 Ruddlesden-Popper phases Sr2-xLn1+xMn2O7 (0 â?¤ x â?¤ 0.5, Ln = La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Y, and Er) are described. The crystal chemistry and stability of this structure is governed by the size of the lanthanide cation. Partial ordering of the Sr2+ and Ln3+ cations occurs between the two available A cation (A = Ln3+, Sr2+) sites, with the smaller lanthanides preferring the site in the rock-salt layer over that in the perovskite block. This ordering is almost complete for the small lanthanides (Tb-Er), and these ordered compounds can be prepared as single phases. Cation disorder in compounds of the larger lanthanides is accompanied by a subtle separation into two n = 2 Ruddlesden-Popper phases, which is apparent only upon detailed inspection of Rietveld refinements of the X-ray profiles. In these cases, the two-phase model is found to be superior to a single phase model with strain broadening included. For a particular lanthanide, both the ease of synthesis of single phases and the extent of cation ordering depend on the manganese oxidation state.

Item Type: Article
Additional information: Unmapped bibliographic data: LA - English [Field not mapped to EPrints] J2 - Chem. Mater. [Field not mapped to EPrints] AD - Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QR, United Kingdom [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
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: Giles Tarver
Date Deposited: 21 Oct 2015 14:06 UTC
Last Modified: 29 May 2019 16:11 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/51158 (The current URI for this page, for reference purposes)
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