SmarTeam

 

Germanium

Optical Material Information*

Chemical Formula

Ge

Refractive Index (at 4.87 microns)

4.02

Knoop Hardness (psi)

550

Modulus of Rupture (psi)

7000

Useful Wavelength Range, Transmission (microns)

2.0-17

Useful Wavelength Range, ATR (microns)

2.0-11.4

Maximum Useful Temperature (ēC)

125

Melting Point (ēC)

936

General Properties

Hard and brittle; temperature sensitive; subject to thermal shock; good thermal conductivity; becomes opaque at 125ēC; metallic appearance.

Chemical Properties

Insoluble in water; soluble in hot H2SO4, nitric acid, aqua regia and molten alkalis; resists hot conc. HCl acid, hot conc. HF acid, and hot conc. NaOH solution; not attacked by cold sulfuric acid; slow oxidation in air; non-hygroscopic.

Clean with...

Alcohol, acetone, water.

*This was compiled from various sources. For more details, consult the Chemical Abstracts Service at www.cas.org.

 

Transmission Spectrum

 

Transmission Spectra at Several Temperatures (1.15 mm thickness)

 

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