Mössbauer spectra and magnetic susceptibility of neptunium tetrabromide

Magnetic properties of NpBr4 were studied from 4.2 to 20.0 °K with the Mössbauer resonance of the 59.54-keV γ ray in 237Np. Magnetic susceptibility was measured from 2.2 to 70.5 °K using a vibrating sample magnetometer at an applied field of 10 KOe. An antiferromagnetic transition was found at 12.5±...

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Bibliographic Details
Published in:The Journal of chemical physics 1976-01, Vol.64 (4), p.1492-1494
Main Authors: Stevens, J. L., Jones, E. R., Karraker, D. G.
Format: Article
Language:English
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Summary:Magnetic properties of NpBr4 were studied from 4.2 to 20.0 °K with the Mössbauer resonance of the 59.54-keV γ ray in 237Np. Magnetic susceptibility was measured from 2.2 to 70.5 °K using a vibrating sample magnetometer at an applied field of 10 KOe. An antiferromagnetic transition was found at 12.5±0.5 °K. Above the Néel temperature, NpBr4 obeys the Curie–Weiss law, χ=C/(T+ϑ), with ϑ equal to 16.2 °K and an effective moment of 2.60 μB. The Mössbauer spectra exhibited magnetic hyperfine splitting over the temperature range 4.2 to 20 °K with g0μnHeff=10.4 cm/sec at 4.2 °K. A small decline in g0μnHeff was observed for temperatures above 12 °K.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.432366