Mössbauer recoilless fraction and atomic rearrangements in amorphous ${\mathrm{Fe}}_{32}$${\mathrm{Ni}}_{36}$${\mathrm{Cr}}_{14}$${\mathrm{P}}_{12}$${\mathrm{B}}_6$

The amorphous glass, ${\mathrm{Fe}}_{32}$ ${\mathrm{Ni}}_{36}$ ${\mathrm{Cr}}_{14}$ ${\mathrm{P}}_{12}$ ${\mathrm{B}}_6$ (METGLAS® 2826A), has been investigated from 300 to 850 K by Mössbauer and x-ray spectroscopy. In particular, the recoilless fraction and the shape of the Mössbauer spectrum have been investigated with emphasis on possible tunneling and diffusion effects in the crystallization region. A change in the recoilless fraction occurs just before the onset of any identifiable crystallization and suggests that a reversible atomic rearrangement precedes the crystallization process.