Abstract
The influence of interstitial H, C and N atoms on structure and intrinsic magnetic properties of Nd(Fe,M)12Zy (M = Ti, V, Mo; Z = H, C, N) was studied. Interstitial hydrogen uptake is reversible, expands the lattice and has a small, but positive effect on the intrinsic magnetic properties. Upon C and N absorption, the ThMn12-type crystal structure is preserved in the case of M = Mo, but a decomposition process and strong growth of the content of -Fe is observed at temperatures above 450 °C for M = Ti or V. Along with this decomposition process, a deterioration of the magnetic properties (measured at room temperature) occurs. For M = Ti or V, the highest values of the Curie temperature, saturation polarization and anisotropy field were found just before the decomposition process starts. For M = Mo, the Curie temperature and anisotropy field have the highest values for Z = N, with maxima for a nitrogen concentration of 1 per formula unit. At low temperatures, the high field magnetization curves of all carburized compounds investigated show a metamagnetic transition when the field is applied perpendicularly to the aligned c-axes of the epoxy bonded powders.
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