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We can supply LiF crystal substrates in all common sizes up to a maximum diameter of 60mm (depending on orientation). Please get in touch here if you require another size.
- Name: Lithium Fluoride, LiF wafers
- 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).
If you have any questions please contact us on info@crystalsubstrates.com
Dr Joseph Franklin
| 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): | 25.94 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 |
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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.
- USA FedEx 2 day delivery: typically $25 USD
- USA FedEx Overnight Delivery: typically $65USD.
- Canada FedEx International Priority: typically $25 USD.
Europe and UK Delivery? Approx cost for delivery is 50 Euros. Shipping costs will be calculated at check-out based on your address or please complete the quote form and we will email you the price. VAT and customs charges are payable by the buyer.
Rest of Worldwide Shipping? Shipping costs to the rest of the World, will be calculated at check-out. Please be aware that delivery times and tracking information vary for each country. Customs charges may apply if shipping outside of the US and are payable by the buyer.
How can I place an order? The quickest way to get your item is to buy through the website – the order is automatically picked up in our system and in stock items ships out asap.
We can accept purchase orders for established universities and companies and are happy to work with your institutes payment systems if required (although please note we are a small company so would prefer pre-payment via our website for small or one-off orders).
We have flexible payment options and can give you a quotation in any of the following currencies (USD $, CAD $, GBP £, EUROS € AUD $).
You can download a copy of our W8 form here.
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Do you send substrates to Europe? Yes, we have many long term customers buy from all over Europe including France, UK, Germany, Italy, Norway, Netherlands. Please buy through the website or get in touch if you need a specific substrate.
We believe we have the cheapest and best quality products in the USA. If you find another US company with a lesser price (including delivery) we would be happy to price match.
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