Abstract
Magnetic measurements are carried out on polycrystalline Th2Fe17Cx (x=0,0.6,0.9,1.1) samples between 4 and 850 K and magnetic field up to 7 T. This wide temperature range covers both the ferromagnetically ordered region and the paramagnetic region. The ordering temperature, but also the magnetization is found to be very sensitive to the carbon concentration. The evolution of the magnetic properties versus the carbon content is discussed. The Curie temperature and the Fe-Fe exchange interactions increase when the carbon concentration increases. The mean ordered iron magnetic moment deduced from saturation magnetization is also found to depend upon the carbon concentration. Mean magnetic moment values of 1.79 and 1.98 μB per iron atom are observed for Th2Fe17 and Th2Fe17C1.1, respectively. The effective magnetic moment is found to decrease from 4.40 to 4.09 μB per iron atom for Th2Fe17 and Th2Fe17C1.1, respectively. The increase of the carbon concentration induces a progressive evolution toward a more localized Fe magnetic moment. The evolution of the effective magnetic moment is discussed on the basis of the spin fluctuations theory. The iron magnetic state in the Th2Fe17Cx compounds present similarities with that reported for the Fe3C compound.
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