Abstract
The carbides of NdDy0.2Fe12−yMoyC0.6 (y = 1.5,2)crystallized in the ThMn12-type structure have beensuccessfully synthesized by arc melting method, followed by a heattreatment. The magnetic properties are strongly enhanced with theaddition of carbon. Upon the carbonation the saturation magnetizationMs is increased by about 20 emu/g and the Curietemperature Tc is enhanced by 40–70 K. The spinreorientation (SR) temperature decreases from 125 K forNdDy0.2Fe10Mo2 to 55 K forNdDy0.2Fe10Mo2C0.6 indicating the change ofmagnetocrystalline anisotropy in the Nd sublattice. It is found thatthe intrinsic magnetic properties of the carbides can be improved byfurther nitrogenation. The composite carbon–nitrogen compounds show aTc~560 K, Ms~105 emu/g and Ha (anisotropyfield) ~86 kOe for NdDy0.2Fe10Mo2C0.6Nzand a Tc~628 K, Ms~119 emu/g and Ha~115 kOe for NdDy0.2Fe10.5Mo1.5C0.6Nz. Thesemagnetic properties are even better than those of simple nitrides,suggesting that these compounds can be considered as a good candidatefor permanent magnet applications.
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