Lithium Fluoride Crystal
| Product | Lithium Fluoride (LiF) Crystal |
| Part Number | SB19 |
About Lithium Fluoride (LiF) Crystal
Lithium Fluoride (LiF) Crystal is an optical material with outstanding transmittance in VUV region. It is widely used in windows, prisms and lenses for 0.105 µm-6 µm visible light and infrared light.
Optical Properties
| Transmission Range | 105 nm to 6 μm |
| Refractive Index | 1.3733 at 2.5 μm; 1.6240 at 121 nm |
| Reflection Loss | 4.4% at 4 μm |
Advantages of LiF:
LiF single crystal is sensitive to thermal shock and would be attacked by atmospheric moisture at 400°C. When working at a high temperature of 600°C, the LiF crystal softens and is slightly plastic, so it can be bent into radius plates. In addition, radiation produces color centers. Hence, users should take measures to protect LiF crystals from moisture and high energy radiation damages.
NCE provides LiF crystals grown using Czochralski technology. In addition, we can also provide other types of window crystals like YAG, BaF2, and MgF2 crystals, etc. Please contact us for more details. Get a Quote Now! For other optical materials, please check our Optical Materials category page.
Other Trade Name: single crystal LiF
Typical Applications of LiF:
Lithium Fluoride Crystal is used as windows, lenses for the 105 nm to 6 μm light. And it can also be used as the optical element in X-ray diffraction devices.
Typical Specification – Lithium Fluoride (LiF) Crystal
| Orientation: | <100> or others on request |
| Wavefront Distortion: | λ/4 per inch @ 632.8 nm |
| Dimension Tolerances： | ±0.1 mm |
| Surface Quality: | 20/10 Scratch |
| Parallelism: | < 20″ |
| Perpendicularity: | < 10′ |
| Clear Aperture: | > 90% |
| Surface Flatness: | < λ/8 @ 632.8 nm |
| Chamfer: | < 0.25 mm @ 45 deg. |
| Size: | Upon customer request |
Order Information
Inquiries and orders should include the following information:
- Quantity
- Dimensions
- Crystal orientation
- Polishing or grind finish
Packing and Storage
Standard Packing: 100 pcs in clean sealed bags. Special package is available on request.
Typical Properties of LiF Crystal
| Density | 2.64 g/cm3 |
| Melting Point | 845°C |
| Molar Mass | 25.9394 |
| Lattice Parameters | 4.0279 Å |
| Thermal Conductivity | 4.01 W/(m·K) |
| Specific Heat | 1562 (J·kg-1·K-1) |
| Thermal Expansion Coefficient | 28.1 – 34.8 (10-6/K) |
| Knoop Hardness | 102–103 kg/mm2 |
| Mohs Hardness | 3 |
| Young’s Modulus | 64.79 GPa |
| Shear Modulus | 55.14 GPa |
| Bulk Modulus | 62.03 GPa |
| Rupture Modulus | 10.8 MPa |
| Elastic Coefficient | C11 = 112 / C12 = 45.6 / C44 = 3.2 GPa |
| Crystal Type | Cubic |
| Dielectric Constant | 9.0 @ 25°C, f = 100…109 Hz |
| Solubility in Water | 0.27 (g/100 cm3) @ 18°C |
| Apparent Elastic Limit/ MPa | 11.2 @1620 psi |
| Cleavage | (100) |
