Germanium
Germanium is a metallic element with a high melting point, high hardness, low electrical conductivity and high corrosion resistance. Its atomic number is 32 and its atomic weight is 72.64. It is a silvery-white solid at room temperature and readily oxidizes at high temperatures. Its high melting point and hardness give it excellent performance in infrared optical components. Germanium can be used in both long-wave and mid-wave infrared systems, with markedly different dispersion in different bands. Its Abbe number is 103 over 3–5μm, where it is generally used in the negative group of an optical system; over 8–12μm, its Abbe number is 864, where it is generally used in the positive group.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Density | 5.325 g/cm3 |
| Electrical Resistivity | 0.005-50ohm.cm |
| Transmittance | 47@6-14.6um |
| Thermal Conductivity | 59.9 W/mk |
| Coefficient of Thermal Expansion | 6.0×10-5/℃ |
| Specific Heat Capacity | 322 |
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