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Products>Waveplates Crystals>>Ge Crystal | ||||||||||||||
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Ge
Crystal |
|
Germanium (Ge) |
|
BASE PROPERTIES |
PARAMETER |
VALUE |
OPTICAL |
|
Transmission Range |
1.8 to 23 microns |
Refractive Index |
4.0026 at 11 microns |
Reflection Loss |
53% at 11 microns (2 surfaces) |
Absorption Coefficient |
1.3 x 10-3e cm-1 at
3.8 microns |
dN/dT |
-10.6 x 10-6e/°C |
dN/dμ = 0 |
R.I. almost constant |
PHYSICAL |
|
Density |
5.33 g/cm3 |
Melting Point |
936 °C |
Thermal Conductivity |
58.61 W/(m*K)at 293K |
Thermal Expansion |
6.1 x 10-6e/°C at 298K |
Hardness |
Knoop 780 kg/mm2 (100) |
Specific Heat Capacity |
310J/(kg K) |
Dielectric Constant |
16.6 at 9.37GHz at 300K |
Young's Modulus (E) |
102.7 GPa |
Shear Modulus (G) |
67 GPa |
Bulk Modulus (K) |
77.2 GPa |
Elastic Coefficients |
C11 = 129 C12 = 48.3 C44 = 67.1 |
Apparent Elastic Limit |
89.6 MPa (13000psi) |
Poisson Ratio |
0.28 |
CHEMICAL |
|
Solubility |
Insoluble in water |
Molecular Weight |
72.59 |
Class/Structure |
Cubic diamond, Fd3m |
REFRACTIVE INDEX | ||||||
Wavelength,
μm |
2.06 |
2.15 |
2.44 |
2.58 |
3.00 |
3.42 |
Refractive
Index |
4.10 |
4.09 |
4.07 |
4.06 |
4.05 |
4.03 |
Wavelength,
μm |
4.36 |
6.24 |
8.66 |
9.72 |
11.04 |
13.02 |
Refractive
Index |
4.03 |
4.01 |
4.00 |
4.00 |
4.00 |
4.00 |
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