Point defects in amorphous Fe₈₀B₂₀and Fe₄₀Ni₄₀P₁₄B₆studied by positron lifetime and magnetic after-effect

Amorphous Fe80B20 and Fe40Ni40P14B6 alloys are studied before and after low temperature electron irradiations by positron lifetime and magnetic after-effect methods. The results show that in amorphous state all positrons are trapped by quenched-in voids of less than one atomic volume. Electron irradiation produces vacancy-like defects which recover continuously up to room temperature making only a few reorientation jumps before annealing.