NMR studies of 93Nb in FeNbB nanocrystalline alloy

Amorphous and nanocrystalline Fe 80.5 Nb 7 B 12.5 ribbons were investigated using nuclear magnetic resonance (NMR). A direct observation of the Nb environments was performed. The local anisotropy of the Nb-containing grains or phases is almost the same for the as-cast and the sample heat treated at 510°C for 1 h. After a 610°C/1 h annealing, the presence of pure α-Fe is observed and the anisotropy of the Nb phase decreases.