POINT DEFECTS IN AMORPHOUS Fe₈₀B₂₀ AND Fe₄₀Ni₄₀P₁₄B₆ STUDIED BY POSITRON LIFETIME AND MAGNETIC AFTER-EFFECT.

Amorphous Fe//8//0B//2//0 and Fe//4//0Ni//4//0P//1//4B//6 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 positron 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.