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Mateck Germanium (Ge)
| Category | Pure Element |
| Manufacturer | Mateck GmbH |
| Trade Name | |
| Port | Shanghai port,China |
| Trade Terms | FOB, CFR, CIF |
| Payment Terms | L/C, T/T, Western Union |
| Download PDF | Mateck Germanium (Ge).pdf  |
| Price | EMAIL US sales@lookpolymers.com |
Material Notes:
Optical crystals
| Physical Properties | Metric | English | Comments |
|---|---|---|---|
| Density | 5.33 g/cc @Temperature 25.0 °C |
0.193 lb/in³ @Temperature 77.0 °F |
|
| Solubility | 0.00 ppm | 0.00 ppm | |
| a Lattice Constant | 5.657 Ã… | 5.657 Ã… | |
| Molecular Weight | 72.61 g/mol | 72.61 g/mol |
| Mechanical Properties | Metric | English | Comments |
|---|---|---|---|
| Vickers Microhardness | 9000 | 9000 | MPa |
| Hardness, Mohs | 6.0 | 6.0 | |
| Modulus of Elasticity | 103.2 GPa | 14970 ksi | in <100> direction |
| 155.6 GPa | 22570 ksi | in <111> direction | |
| Poissons Ratio | 0.278 | 0.278 | |
| Shear Modulus | 46.7 GPa | 6770 ksi | in <111> direction |
| 67.2 GPa | 9750 ksi | in <100> direction |
| Thermal Properties | Metric | English | Comments |
|---|---|---|---|
| CTE, linear | 5.10 - 5.80 µm/m-°C @Temperature -60.0 - 60.0 °C |
2.83 - 3.22 µin/in-°F @Temperature -76.0 - 140 °F |
|
| Specific Heat Capacity | 0.310 J/g-°C | 0.0741 BTU/lb-°F | |
| Thermal Conductivity | 59.8 W/m-K @Temperature 27.0 °C |
415 BTU-in/hr-ft²-°F @Temperature 80.6 °F |
|
| Melting Point | 937 °C | 1720 °F |
| Optical Properties | Metric | English | Comments |
|---|---|---|---|
| Refractive Index | 4.0034 | 4.0034 | n10.6 |
| 4.0017 @Wavelength 15000 nm |
4.0017 @Wavelength 15000 nm |
||
| 4.004 @Wavelength 10000 nm |
4.004 @Wavelength 10000 nm |
||
| 4.0076 @Wavelength 7000 nm |
4.0076 @Wavelength 7000 nm |
||
| 4.1079 @Wavelength 2000 nm |
4.1079 @Wavelength 2000 nm |
||
| IR Transmittance | 56 % @Wavelength 15000 nm |
56 % @Wavelength 15000 nm |
Internal Transmittance |
| 70 % @Wavelength 12000 nm |
70 % @Wavelength 12000 nm |
Internal Transmittance | |
| 97 % @Wavelength 3000 nm |
97 % @Wavelength 3000 nm |
Internal Transmittance | |
| 97 % @Wavelength 9000 nm |
97 % @Wavelength 9000 nm |
Internal Transmittance |
| Descriptive Properties | Value | Comments |
|---|---|---|
| Cleavability | (111) | perfect |
| Constants of Elastic Compliance (Pa^-1) | 1.489E-11 | |
| -2.65E-12 | ||
| 9.69E-12 | ||
| Symmetry Class | m3m | |
| Syngony | cubic | |
| Thermal Coefficient of Refractive Index | 3.5E-4 to 4E-4 | 3.39 microns for ± 60°C |
| Transmission Range (microns) | 2 - 17 |
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