Abstract
The effect of absorbed hydrogen on the magnetic structure of f.c.c. invar alloys, Fee5Ni35, Fe6GNi31Mn3 and Fe69Ni2eC3, was studied by means of Fe Mossbauer effect. As the electrolytic hydrogenation preceeded, the characteristic absorption spectrum with low internal field components, which is believed to be an origin of the invar effect of these alloys, was drastically changed and hydride phases appeared in large fractions. The spectral analysis showed that the hydrides with the same f.c. c. structure as the matrix phase lost the weak field components and only strong ferromagnetic components remained. This effect of hydrogen on the magnetic structure of invar alloys was interpreted in terms of 3d hole filling with electrons from solute hydrogen in the Stoner's band model. A reverse effect found by a previous study on a non-invar Fe Ni alloy that the internal field of the hydride became about 15% smaller than that of the matrix phase was explained by the same model.
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