Structural changes observed in (Mosub(.6)Rusub(.4))sub(x)Bsub(1-x) amorphous alloys observed with positron annihilation

Changes in the structure of (Mosub(.6)Rusub(.4))sub(x)Bsub(1-x) amorphous alloys were observed in positron annihilation analysis using both positron lifetime and Doppler broadening techniques. The changes were introduced into the alloy either by varying the boron fraction or by neutron irradiation. Similar results were observed both in the irradiated alloys and those with vacant boron sites. The positron annihilation data suggest that the modified structure contains regions of open volume and that the positrons interact with those regions. (Auth.)