Abstract
The magnetic susceptibility χ of coarse-grained WC and nanocrystalline n-WC tungsten carbides has been studied in a temperature range of 300–1250 K. The dependence χ (T) for coarse-grained WC carbide has no singularities. A stable particle size of about 55 nm remains in the n-WC nanopowder after annealing at 300–1200 K, whereas the relaxation of microstrains occurs at 550–920 K. The dependence χ(T) for nanocrystalline n-WC carbide in a range of 550–920 K exhibits features associated with the annealing of microstrains, which reduces the contribution of orbital paramagnetism to the susceptibility of n-WC carbide and initiates the precipitation of small iron and cobalt impurities in the form of superparamagnetic particles.
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Translated from Pis’ma v Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} \) Fiziki, Vol. 82, No. 8, 2005, pp. 567–572.
Original Russian Text Copyright © 2005 by Kurlov, Nazarova, Gusev.
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Kurlov, A.S., Nazarova, S.Z. & Gusev, A.I. Magnetic susceptibility of tungsten carbide: Relaxation and impurity effects. Jetp Lett. 82, 509–514 (2005). https://doi.org/10.1134/1.2150871
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DOI: https://doi.org/10.1134/1.2150871