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 (ºC) | 125 |
| Melting Point (ºC) | 936 |
| General Properties | Hard and brittle; temperature sensitive; subject to thermal shock; good thermal conductivity; becomes opaque at 125ºC; 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
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Transmission Spectra at Several Temperatures (1.15 mm thickness)
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