Amorphous metallic glasses are generally most easily prepared if one of the components is a metalloid or "near metalloid" such as boron, carbon, silicon, phosphorus or germanium. Aside from thin films deposited at very low temperatures, the first known metallic glass was an alloy of composition Au 75 Si 25 reported in 1960. A metallic glass having a strength and toughness not previously seen, of composition Pd 82.5 P 6 Si 9.5 Ge 2, was reported in 2011.