Potassium Bromide (KBr)
| Crystal properties | ||
| Crystal Type | cubic, NaCl type structure | |
| Transmission Range | 0.23 ... 25 µm | |
| Refractive Index | 1.52695 @ 9.724 µm | |
| Reflective Loss | 8.4 % @ 10.0 µm | |
| Reststrahlen | 77.6 µm | |
| Density | 2.7533 g/cm3 | |
| Melting Point | 730 °C | |
| Molecular Weight | 119.002 | |
| Thermal Conductivity | 4.816 W/(m K) @ 46 °C | |
| Specific Heat | 435 J/(kg K) @ 0 °C | |
| Thermal Expansion | 43 × 10–6 / K | |
| Hardness (Knoop) | 5.9 <110> 7.0 <100> Indenter load 200 g |
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| Young’s Modulus | 26.8 GPa | |
| Shear Modulus | 5.08 GPa | |
| Bulk Modulus | 15.03 GPa | |
| Rupture Modulus | 0.33 MPa | |
| Elastic Coefficient | C11 = 34.5 C12 = 5.4 C44 = 5.08 GPa |
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| Dielectric Constant | 5.65 @ 25 °C, f = 100 Hz ... 10 GHz | |
| Solubility in Water | 53.4 g / 100 g @ 0 °C | |
| Crystal Structure | Single crystal, synthetic | |
| Cleavage Planes | (100) | |
| Standard Diameter | 180 mm | |
| Application | IR spectroscopy FTIR beamsplitters CO2 laser optics protective windows |
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| Remarks | coatings available | |
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List of optical crystals |
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