Evolution of the structure of the K{sub 2}NiF{sub 4} phases La{sub 2{minus}x}Sr{sub x}NiO{sub 4+{delta}} with oxidation state: Octahedral distortion and phase separation (0.2 {le} x {le} 1.0)

Millburn, J E; Green, M A; Rosseinsky, M J; Neumann, D A

doi:10.1006/jssc.1999.8111

Title: Evolution of the structure of the K{sub 2}NiF{sub 4} phases La{sub 2{minus}x}Sr{sub x}NiO{sub 4+{delta}} with oxidation state: Octahedral distortion and phase separation (0.2 {le} x {le} 1.0)

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Abstract

The structural properties of the La{sub 2{minus}x}Sr{sub x}NiO{sub 4+{delta}} 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 NiO{sub 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 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 LaSrNiO{sub 4+{delta}} 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.

Authors:

Millburn, J E; Green, M A; Rosseinsky, M J ^[1]; Neumann, D A ^[2]

Univ. of Oxford (United Kingdom). Dept. of Chemistry
National Inst. for Standards and Technology, Gaithersburg, MD (United States). Centre for Neutron Research

Publication Date:: Thu Jul 01 00:00:00 EDT 1999

OSTI Identifier:: 679240

Resource Type:: Journal Article

Journal Name:: Journal of Solid State Chemistry

Additional Journal Information:: Journal Volume: 145; Journal Issue: 2; Other Information: PBD: Jul 1999

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; PHASE STUDIES; CRYSTAL STRUCTURE; LANTHANUM OXIDES; STRONTIUM OXIDES; NICKEL OXIDES; CHEMICAL COMPOSITION; SOLID SOLUTIONS; NEUTRON DIFFRACTION; EXPERIMENTAL DATA

Citation Formats


                    Millburn, J E, Green, M A, Rosseinsky, M J, and Neumann, D A. Evolution of the structure of the K{sub 2}NiF{sub 4} phases La{sub 2{minus}x}Sr{sub x}NiO{sub 4+{delta}} with oxidation state: Octahedral distortion and phase separation (0.2 {le} x {le} 1.0).  United States: N. p., 1999. 
        Web.  doi:10.1006/jssc.1999.8111.

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                    Millburn, J E, Green, M A, Rosseinsky, M J, & Neumann, D A. Evolution of the structure of the K{sub 2}NiF{sub 4} phases La{sub 2{minus}x}Sr{sub x}NiO{sub 4+{delta}} with oxidation state: Octahedral distortion and phase separation (0.2 {le} x {le} 1.0).  United States.  https://doi.org/10.1006/jssc.1999.8111

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                    Millburn, J E, Green, M A, Rosseinsky, M J, and Neumann, D A. 1999.  
        "Evolution of the structure of the K{sub 2}NiF{sub 4} phases La{sub 2{minus}x}Sr{sub x}NiO{sub 4+{delta}} with oxidation state: Octahedral distortion and phase separation (0.2 {le} x {le} 1.0)".  United States.  https://doi.org/10.1006/jssc.1999.8111.

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@article{osti_679240,

  title        = {Evolution of the structure of the K{sub 2}NiF{sub 4} phases La{sub 2{minus}x}Sr{sub x}NiO{sub 4+{delta}} with oxidation state: Octahedral distortion and phase separation (0.2 {le} x {le} 1.0)},

  author       = {Millburn, J E and Green, M A and Rosseinsky, M J and Neumann, D A},

  abstractNote = {The structural properties of the La{sub 2{minus}x}Sr{sub x}NiO{sub 4+{delta}} 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 NiO{sub 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 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 LaSrNiO{sub 4+{delta}} 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.},

  doi          = {10.1006/jssc.1999.8111},

  url          = {https://www.osti.gov/biblio/679240},
  journal      = {Journal of Solid State Chemistry},
number       = 2,

  volume       = 145,

  place        = {United States},

  year         = {Thu Jul 01 00:00:00 EDT 1999},

  month        = {Thu Jul 01 00:00:00 EDT 1999}

}

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