Silicon alloys

thumb|250px|Ferrosilicon alloy

Iron alloy optimized for magnetic properties

SiGe ( or ), or silicon–germanium, is an alloy with any molar ratio of silicon and germanium, i.e. with a molecular formula of the form Si1−xGex. It is commonly used as a semiconductor material in integrated circuits (ICs) for heterojunction bipolar transistors or as a strain-inducing layer for CMOS transistors. IBM introduced the technology into mainstream manufacturing in 1989. This relatively new technology offers opportunities in mixed-signal circuit and analog circuit IC design and manufacture. SiGe is also used as a thermoelectric material for high-temperature applications (>700 K).

precipitation hardening aluminium alloy

Nicrosil is a nickel alloy containing about 14.4% chromium, 1.4% silicon, and (in some sources) 0.1% magnesium.

Nisil is an alloy of nickel (95.5% wt.) and silicon (4.4% wt.) with traces of Mg (0.1% wt.), which is non-magnetic.