Nuclear Magnetic Resonance of Iron-Rich Fe–V Alloys

Abstract

Vanadium concentration dependence of nuclear magnetic resonance are observed at 4.2 K for iron-rich Fe–V alloys up to 10.0 at% vanadium. On the spectra of Fe⁵⁷: a satellite due to an iron atom having only one vanadium atom in its 1st nearest neighbor, was observed for each specimen. The monotonic increase of the hyperfine field at iron nuclei with the concentration of vanadium shows the contribution of negative moment polarization of the vanadium atoms. Variation of the Curie temperature with vanadium appears to be explained with a simple molecular field theory using the magnetic moment of iron obtained from the NMR observation. On the spectra of V⁵¹: the effect of the repulsion between vanadium atoms which reduces the intensity of the satellite is discussed. For 1.1 at% V alloy, a satellite which may be attributable to a vanadium having vanadium atoms located farther than the 1st nearest was newly observed.