MOSSBAUER STUDY OF THE GLASS-TRANSITION IN A METALLIC-GLASS

The glass transition in the pseudo-binary metallic glass Zr67Ni10Cu23 doped with 0.5 at.% Fe-57 has been studied by Mossbauer spectroscopy. The glass transition appears as a sudden drop in the recoil-free fract ion and an increase in the linewidth, consistent with changes in both the specific heat and the thermal expansion coefficient. The glass tra nsition temperature determined from the change in the temperature depe ndence of the hyperfine parameters is in agreement with the value obta ined from calorimetry. The results are discussed and compared with tho se of conventional glasses.