INFLUENCE OF INTERSTITIAL HYDROGEN ON MAGNETISM AND LATTICE PARAMETER OF FERROMAGNETIC NICR-ALLOYS

Measurements of magnetization, X-ray studies and volumetric investigations show that ferromagnetic nickel-chrome alloys (2 to 7% Cr) absorb hydrogen in high concentrations (β-phase). Caused by the interstitial hydrogen atoms NiCr looses its ferromagnetism, combined with reversibly enlarged lattice constants of some percent (decreasing with increasing Cr-content). The variation of lattice expansion Δ a with Cr-content is in some way similar to the recently found proportionality of Δ a with the mean magnetic moment in the case of NiCu and NiCu-hydrogen-alloys but deviating in a characteristic manner. - X-ray studies also showed an additional increase of Δ a by supersaturation of the β-phase, and the occurrance of a second phase with very low values of Δ a. © 1969 Springer-Verlag.