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), 1-13. (doi:10.1006/jssc.1999.8539).

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Original Publication URL: http://dx.doi.org/10.1006/jssc.1999.8539

Description/Abstract

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.

Item Type: Article
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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
Subjects: Q Science
Q Science > QD Chemistry
Divisions: University Structure - Pre August 2011 > School of Chemistry
ePrint ID: 18876
Date Deposited: 05 Jan 2006
Last Modified: 27 Mar 2014 18:08
URI: http://eprints.soton.ac.uk/id/eprint/18876

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