Synthesis and structure of a new family of nickelates

Tl(Ln2Sr2)Ni2O9, Ln=La, Pr, Nd, Sm, Eu, and Gd

C.S. Knee, M.T. Weller

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

A novel series of nickelates described by the formula Tl(Ln2Sr2)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) Å and c=30.055–29.390(1) Å. The compounds adopt the 1201–0201 intergrowth structure, consisting of layers of apex-sharing stoichiometric NiO6 octahedra connected by a TlO 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, Tl(La2Sr2)Ni2O9 and Tl(Gd2Sr2)Ni2O9.
Original languageEnglish
Pages (from-to)1-13
JournalJournal of Solid State Chemistry
Volume150
Issue number1
DOIs
Publication statusPublished - 15 Feb 2000

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Lanthanoid Series Elements
Rare earth elements
Strontium
Neutron powder diffraction
synthesis
cells
Magnetic susceptibility
strontium
X ray powder diffraction
cuprates
Lattice constants
contraction
neutron diffraction
lattice parameters
Magnetization
apexes
Ions
magnetic permeability
diffraction
ions

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Synthesis and structure of a new family of nickelates : Tl(Ln2Sr2)Ni2O9, Ln=La, Pr, Nd, Sm, Eu, and Gd. / Knee, C.S.; Weller, M.T.

In: Journal of Solid State Chemistry, Vol. 150, No. 1, 15.02.2000, p. 1-13.

Research output: Contribution to journalArticle

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abstract = "A novel series of nickelates described by the formula Tl(Ln2Sr2)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) {\AA} and c=30.055–29.390(1) {\AA}. The compounds adopt the 1201–0201 intergrowth structure, consisting of layers of apex-sharing stoichiometric NiO6 octahedra connected by a TlO 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, Tl(La2Sr2)Ni2O9 and Tl(Gd2Sr2)Ni2O9.",
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AB - A novel series of nickelates described by the formula Tl(Ln2Sr2)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) Å and c=30.055–29.390(1) Å. The compounds adopt the 1201–0201 intergrowth structure, consisting of layers of apex-sharing stoichiometric NiO6 octahedra connected by a TlO 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, Tl(La2Sr2)Ni2O9 and Tl(Gd2Sr2)Ni2O9.

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