Neutron diffraction studies of the crystal and magnetic structure of Nd1.5Sr0.5NiO4

J. E. Greedan, Guo Liu, B. W. Arbuckle, K. V. Ramanujachary, M. Greenblatt

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Abstract

The crystal structure and magnetic ordering of Nd1.5Sr0.5NiO4 which shows a susceptibility maximum at 17 K have been investigated by neutron diffraction. A tetragonal K2NiF4-type structure is confirmed at room temperature with a = 3.7756(3) Å and c = 12.485(1) Å. A mean NiO distance of 1.986(5) Å reflects the presence of equal concentrations of Ni2+ and Ni3+. Low temperature neutron diffraction data to 11 K reveal features not apparent in the bulk susceptibility. Below 50 K a broad, diffuse reflection at Q = 0.835 Å-1 is found which can be indexed as ( 1 200) relative to the chemical cell. The intensity of this peak has an unusual temperature dependence with abrupt increases between 25 and 21 K and between 14 and 11 K. The correlation length derived from the peak width decreases from a constant value of 20(4) Å between 14 and 21 K to 12(2) Å at 11 K. Also at 11 K a resolution-limited reflection appears which can be indexed as (101) on a magnetic cell with aM = √2aCH which is typical for long-range antiferromagnetic order in K2NiF4 structure compounds. The diffuse ( 1 200) reflection is ascribed to short-range magnetic order on the Ni sublattice while the long-range order below 11 K involves most likely NdNi intersublattice coupling. Both forms of order coexist at 11 K.

Original languageEnglish (US)
Pages (from-to)419-426
Number of pages8
JournalJournal of Solid State Chemistry
Volume97
Issue number2
DOIs
StatePublished - Apr 1992

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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