This article is cited in 6 papers

CONDENSED MATTER

Magnetic susceptibility of tungsten carbide: Relaxation and impurity effects

A. S. Kurlov, S. Z. Nazarova, A. I. Gusev

Institute of Solid State Chemistry, Urals Branch of the Russian Academy of Sciences

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.

PACS: 61.46.+w, 75.75.+a, 81.07.-b, 81.40.Rs

Received: 22.08.2005

 English version: Journal of Experimental and Theoretical Physics Letters, 2005, 82:8, 509–514

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