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Author Knee, C. S. ♦ Weller, M. T.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ CRYSTAL STRUCTURE ♦ THALLIUM OXIDES ♦ STRONTIUM OXIDES ♦ NICKEL OXIDES ♦ X-RAY DIFFRACTION ♦ NEUTRON DIFFRACTION ♦ LATTICE PARAMETERS ♦ VACANCIES ♦ EXPERIMENTAL DATA
Abstract TlSr{sub 2}NiO{sub 4+{delta}} has been synthesized and its structure determined using high-resolution neutron powder diffraction data collected at 5 K, 90 K, and room temperature. It crystallizes in an orthorhombic cell, space group Pmmm, lattice parameters a = 3.7217(1), b = 7.5158(2), and c = 8.8321(3) {angstrom}. The compound is isostructural with the orthorhombic form of TlSr{sub 2}CuO{sub y}, with alternating TlO and oxygen-deficient NiO{sub 2{minus}x} layers connected through oxygen. Ordering of the oxygen vacancies in the NiO{sub 2{minus}x} layer occurs, producing a superstructure with alternating NiO{sub 6} octahedra and NiO{sub 4} square planes along the b-direction. A comparison between the nickel and copper environments in the two materials is performed. Magnetic susceptibility data reveal that TlSr{sub 2}NiO{sub 4+{delta}} displays Curie-Weiss behavior in the range 80--300 K with a weak antiferromagnetic ordering at 15 K.
ISSN 00224596
Educational Use Research
Learning Resource Type Article
Publisher Date 1999-04-01
Publisher Place United States
Journal Journal of Solid State Chemistry
Volume Number 144
Issue Number 1


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