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Magnetic properties of nickel halide hydrates including deuteration effects.
- Source :
-
Journal of Magnetism & Magnetic Materials . Jan2017, Vol. 421, p393-402. 10p. - Publication Year :
- 2017
-
Abstract
- Magnetic measurements on variously hydrated nickel chlorides and bromides, including deuterated forms, are reported. Results include locations and sizes of susceptibility maxima, T max and χ max , ordering temperatures T c , 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 T max of each bromide hydrate is less than for the corresponding chloride, and that for a given halide n D 2 O ( n =1 or 2) deuterates exhibit lesser T max than do nH 2 O hydrates. A monoclinic unit cell determined from powder X-ray diffraction data on NiBr 2 ·2D 2 O is different from and slightly larger than that of NiBr 2 ·2H 2 O. This provides some rationale for the difference in magnetic properties between these. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03048853
- Volume :
- 421
- Database :
- Academic Search Index
- Journal :
- Journal of Magnetism & Magnetic Materials
- Publication Type :
- Academic Journal
- Accession number :
- 118025939
- Full Text :
- https://doi.org/10.1016/j.jmmm.2016.08.043