Effect of Hydrogen Absorption on the Hyperfine Field of Iron in Amorphous Fe₉₁Zr₉ Alloy

抄録

The effect of hydrogen absorption on the hyperfine field of iron in an amorphous Fe₉₁Zr₉ alloy is investigated by the Mössbauer effect. The Curie temperature of the alloy variously treated is measured by the thermal scan method, and its values are lower than those obtained by means of magnetic measurements, which suggests that the ferromagnetic state of Fe atoms in the amorphous alloy is unstable and readily affected by external magnetic fields used in the magnetic measurements. The hyperfine field distribution indicates that the infused hydrogen atoms migrate to Zr atoms to form Zr–H bonds and weaken the pre-existing Zr–Fe interaction, which results in the increase of the Curie temperature and the averaged hyperfine field.