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Evolution of the Structure of the K2NiF4 Phases La2−xSrxNiO4+δ with Oxidation State: Octahedral Distortion and Phase Separation (0.2≤x≤1.0)

✍ Scribed by J.E. Millburn; M.A. Green; D.A. Neumann; M.J. Rosseinsky

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 398 KB
Volume: 145
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.1999.8111

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✦ Synopsis

The structural properties of the La 2؊x Sr x NiO 4؉ solid solution have been investigated by high resolution powder neutron di4raction as a function of Sr dopant concentration. There is a signi5cant change in the evolution of the shape of the NiO 6 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 di4raction patterns and interpreted as arising from a distribution of La/Sr ratios throughout the sample under these widely used preparative conditions. The re5ned model, incorporating both strain broadening and Bragg peak displacement, can be interpreted as a continuum of phases with di4ering c, but similar a, lattice parameters. Preparation of LaSrNiO 4؉ at 14503C appears to overcome this e4ect but Rietveld re5nement is only possible with the aid of hkl dependent line broadening analysis, in contrast to the other members of the series studied.

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