Local Structure Changes around Cu Atoms in the Early Stage of Nanocrystalline Formation of Amorphous Fe_73.5Cu₁Nb₃Si_13.5B₉

Abstract

Direct evidences that Cu atoms are directly associated with nano-crystalline formation in Fe 73.5 Cu 1 Nb 3 Si 13.5 B 9 (FINEMET) were obtained by fluorescence XAFS measurements. The XAFS results at the Cu K-edge have shown that the local structure around Cu atoms in FINEMET changes from amorphous to fee Cu prior to the bcc-FeSi precipitation.