Magnetic properties of nickel halide hydrates including deuteration effects

G. C. DeFotis, M. J. Van Dongen, A. S. Hampton, C. H. Komatsu, K. T. Trowell, K. C. Havas, C. M. Davis, C. L. DeSanto, K. Hays, M. J. Wagner

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Magnetic measurements on variously hydrated nickel chlorides and bromides, including deuterated forms, are reported. Results include locations and sizes of susceptibility maxima, Tmax and χmax, ordering temperatures Tc, Curie constants and Weiss theta in the paramagnetic regime, and primary and secondary exchange interactions from analysis of low temperature data. For the latter a 2D Heisenberg model augmented by interlayer exchange in a mean-field approximation is applied. Magnetization data to 16 kG as a function of temperature show curvature and hysteresis characteristics quite system dependent. For four materials high field magnetization data to 70 kG at 2.00 K are also obtained. Comparison is made with theoretical relations for spin-1 models. Trends are apparent, primarily that Tmax of each bromide hydrate is less than for the corresponding chloride, and that for a given halide nD2O (n=1 or 2) deuterates exhibit lesser Tmax than do nH2O hydrates. A monoclinic unit cell determined from powder X-ray diffraction data on NiBr2·2D2O is different from and slightly larger than that of NiBr2·2H2O. This provides some rationale for the difference in magnetic properties between these.

Original languageEnglish
Pages (from-to)393-402
Number of pages10
JournalJournal of Magnetism and Magnetic Materials
Volume421
DOIs
StatePublished - Jan 1 2017
Externally publishedYes

Keywords

  • Antiferromagnet
  • Exchange interactions
  • Heisenberg model
  • Magnetic susceptibility
  • Magnetic transition
  • Powder X-ray diffraction

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