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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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.
|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|
Q Science > QD Chemistry
|Divisions:||University Structure - Pre August 2011 > School of Chemistry
|Date Deposited:||05 Jan 2006|
|Last Modified:||01 Jun 2011 11:00|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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