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Germanium Compounds
   Silicon-germanium
   Germanium dioxide (germania)
Silicon-germanium SiGe
This semiconductor material is commonly used in the integrated circuit manufacturing industry.
Germanium dioxide (germania) GeO2
Germanium dioxide's refractive index and optical dispersion properties make it useful as an optical material for wide-angle lenses and in optical microscope objective lenses. It is transparent in infrared.
Mixture of silicon dioxide and germanium dioxide ("silica-germania") is used as an optical material for optical fibres and optical waveguides. Controlling the ratio of the elements allows precise control of refractive index. Silica-germania glasses have lower viscosity and higher refractive index than pure silica.