“…Ultrafine amorphous alloy particles (UAAP) constitute an overlapping area of amorphous alloys and nanophase materials and hence attract a great deal of attention due to their interesting intrinsic properties, e.g., short-range order, long-range disorder and high dispersion, as well as their potential applications in powder metallurgy, magnetic materials, catalysts and ferrofluids, higher activity, better selectivity and stronger poison resistance in many hydrogenation reactions. 412 Ultrafine amorphous alloy particles have properties that are of interest in catalysis including: (i) the presence of a large number of surface coordinatively unsaturated sites, (ii) the lack of crystal defects, and (iii) the isotropic, single phase nature of the materials. Examples of UAAP include M-B (where M ¼ Fe, Co or Ni), Ni-P, Co-P, Fe-P-B (where M ¼ Cr, Co or Ni), Ni-P-B, Fe-Co-B, Fe-Ni-B, Ni-Co-B as well as ultrafine crystalline particles of Co, Co 2 B or Co(BO 2 ) 2 , and Fe, Fe 2 B, Mg, Al, Ni, Pd and Cu.…”