Structure of TlSr{sub 2}NiO{sub 4+{delta}} by high-resolution neutron powder diffraction
- Univ. of Southampton (United Kingdom). Dept. of Chemistry
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.
- OSTI ID:
- 349923
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 144; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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