Evolution of the structure of the K2NiF4 phases La2-xSrxNiO4+δ with oxidation state: Octahedral distortion and phase separation (0.2 � � � 1.0)

Millburn, J.E. and Green, M.A. and Neumann, D.A. and Rosseinsky, M.J. (1999) Evolution of the structure of the K2NiF4 phases La2-xSrxNiO4+δ with oxidation state: Octahedral distortion and phase separation (0.2 � � � 1.0). Journal of Solid State Chemistry, 145 (2). pp. 401-420. ISSN 00224596 (ISSN). (doi:https://doi.org/10.1006/jssc.1999.8111) (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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Official URL
https://doi.org/10.1006/jssc.1999.8111

Abstract

The structural properties of the La2-xSrxNiO4+δ solid solution have been investigated by high resolution powder neutron diffraction as a function of Sr dopant concentration. There is a significant change in the evolution of the shape of the NiO6 octahedron beyond x = 0.6, where previous transport measurements have indicated a transition in the electronic structure. For the x = 1 member of the series prepared under conditions often adopted in the literature, a subtle inhomogeneity is visible in the high-resolution powder diffraction patterns and interpreted as arising from a distribution of La/Sr ratios throughout the sample under these widely used preparative conditions. The refined model, incorporating both strain broadening and Bragg peak displacement, can be interpreted as a continuum of phases with differing c, but similar a, lattice parameters. Preparation of LaSrNiO4+δ at 1450°C appears to overcome this effect but Rietveld refinement is only possible with the aid of hkl dependent line broadening analysis, in contrast to the other members of the series studied. © 1999 Academic Press.

Item Type: Article
Additional information: Unmapped bibliographic data: LA - English [Field not mapped to EPrints] J2 - J. Solid State Chem. [Field not mapped to EPrints] AD - Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford, OX1 3QR, United Kingdom [Field not mapped to EPrints] AD - Natl. Inst. for Std. and Technology, Centre for Neutron Research, Gaithersburg, MD 20899, United States [Field not mapped to EPrints] AD - Royal Institution of Great Britain, 21, Albemarle Street, London, 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 13:59 UTC
Last Modified: 21 Jan 2016 11:09 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/51151 (The current URI for this page, for reference purposes)
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