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Synthesis and structure of a new family of nickelates: Tl(Ln(2)Sr(2))Ni2O9, Ln = La, Pr, Nd, Sm, Eu, and Cd

Knee, C. S. and Weller, M. T. (2000) Synthesis and structure of a new family of nickelates: Tl(Ln(2)Sr(2))Ni2O9, Ln = La, Pr, Nd, Sm, Eu, and Cd Journal of Solid State Chemistry, 150, (1), pp. 1-13. (doi:10.1006/jssc.1999.8539).

Record type: Article


A novel series of nickelates described by the formula Tl(Ln(2)Sr(2))Ni2O9, Ln = La, Pr, Nd, Sm, Eu, and Gd, have been synthesized and their structures determined using both powder X-ray diffraction and powder neutron diffraction. The materials are isostructural with the superconducting cuprate, Tl(La2.4Ba1.6) Cu2O9, crystallizing in a tetragonal unit cell, space group I4/mmm, lattice parameters a = 3.8069-3.7667(1) Angstrom and c = 30.055-29.390(1) Angstrom. The compounds adopt the 1201-0201 intergrowth structure, consisting of layers of apex-sharing stoichiometric NiO6 octahedra connected by a Tl0 layer. A decrease in the cell dimensions is observed across the series, consistent with the lanthanide contraction and partial ordering of the strontium and lanthanide ions on the A cationic sites is observed. Magnetic susceptibility data reveal no evidence of long-range magnetic ordering for two of the compounds, TI(La2Sr2)Ni2O9 and Tl(Gd2Sr2)Ni2O9.

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Published date: 15 February 2000
Keywords: powder x-ray diffraction, neutron diffraction, tl(la1+xba2-x)cu2o9, 1201-0201 intergrowth, k2nif4, layered nickelatesmagnetic-properties, crystal-structure, neutron-diffraction, k2nif4structure, oxides, superconductivity, intergrowth, oxidation, chemistry, la2nio4


Local EPrints ID: 18876
ISSN: 0022-4596
PURE UUID: c576267f-0ffc-437c-b8a2-2bed26e2a8e1

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Date deposited: 05 Jan 2006
Last modified: 17 Jul 2017 16:34

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Author: C. S. Knee
Author: M. T. Weller

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