- Name: Lithium Fluoride, LiF
- Lattice parameter:a=2.008 Å (2a = 4.016Å)
- Crystal Structure: Cubic, Rocksalt
- Commonly used as substrate for: Perpvskites (BaTiO3, PZT, MgO, UO2,
- Surface Roughness: Ra 1 nm (measured 5x5 µm AFM scan)
- Available Dimensions: 5x5 mm to 20x20 mm and customized
- Single or double side polished
- Cut to order 3 weeks
- Excellent optical properties, high transmittance in the deep ultraviolet region (120nm - 400nm up to Infrared 6.0μm
- LiF is toxic if swallowed, & an irritant to skin and eyes
Lithium Fluoride (LiF) belongs to the cubic system, and can be cleaved along (100) plane and less commonly (110) plane. LiF has some of the best optical properties, especially in the deep ultraviolet range. Lithium fluoride crystal transmissibility scope from ultraviolet 105nm to infrared 6.0μm. Therefore LiF are commonly used to produce UV - visible - IR field optical window, lenses, prisms and refraction components.
LiF and temperature:
Compared to the other single crystals available, LiF has a relatively low melting point: 855°C. LiF softens at 600°C and becomes slightly plastic. It is therefore recommended to keep substrate temperature under 600C. LiF also sensitive to thermal shock and can be attacked by atmospheric moisture above 400°C. Under vacuum (e.g. before thin film deposition this should not be an issue however is worth noting in case of any other annealing processes that may be performed. Lastly, LiF suffers from thermal shock therefore LiF should not be exposed to sudden changes in temperature on heating/cooling (before/after deposition).
| LINEAR FORMULA: | LiF |
| PURITY: | >99.99% |
| CRYSTAL ORIENTATION: | (100), (110) & (111) |
| GROWTH METHOD: | Modified Bridgeman technique |
| CRYSTAL STRUCTURE: | cubic |
| LATTICE CONSTANT: | a = 0.4026 |
| MELTING POINT (°C): | 870 |
| THERMAL EXPANSION COEFFICIENT (/K): | 37 (10-6K-1) |
| HARDNESS: | 4 |
| MOLAR MASS (G/MOL): | |
| DENSITY (G/CM3): | 2.64 g/cm3 |
| REFRACTIVE INDEX: | 1.37327 @2.5 µm; 1.624 @0.121 µm |
| DIELECTRIC CONSTANTS: | 9,0 |
| CHEMICAL STABILITY: | |
| SIZES: | 5x5mm & 10x10 mm |
| TYPICAL THICKNESS: | 0.5mm |
| SIZE TOLERANCES: | +/- 0.1mm |
| THICKNESS TOLERANCES: | +/- 0.015mm |
| ORIENTATION PRECISION: | +/-0.5 degree |
| POLISHING OPTIONS: | SINGLE SIDED (1SP) OR BOTH SIDES POLISHED (2SP) |
| ROUGHNESS RA: | <0.5nm |
| ELECTRO-OPTIC COEFFIEIENT | |
| SPECTRAL TRANSMISSION RANGE | |
| NON LINEAR COEFFICIENT |
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How long does it take for you to ship out after purchase? In-Stock Substrates are held in our US warehouse and we aim to have substrates shipped out within 24-48 hours.
Pre-Order Substrates are manufactured and delivered in 3-4 weeks.
How much is shipping? All substrates are shipped free of charge within the USA. This shipping takes approx 4-5 days to arrive once shipped.
Expedited delivery? Faster delivery options are available. Below are some indicative prices. To get the cost for your package and location, just add your address at check out and select the shipping option you want to check.
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