We can provide SiO2 in sizes up to 4 inches diameter. Please get in contact us here if you would like a quotation.
- Name: Single Crystal Silicon dioxide (SiO2), α-quartz
- Commonly used as substrate for: SiO2, GeO2, TiO2, ZnO2, GaPO4
- Surface Roughness: Ra <0.5 nm (measured 5x5 µm AFM scan)
SiO2,); X-cut (11-20), Y-cut (10-10) (90 degrees to X-cut) and Z-cut Z-cut (0001)
SiO2 has a trigonal structure (considered part of hexagonal structure therefore used 4 indices notation.
SiO2 has a trigonal structure (considered part of hexagonal structure therefore used 4 indices notation.
There are several polymorphs of silicon dioxide (SiO2) and there are a few types of silicon dioxide important for thin film applications. This can be in thin films or substrates, amorphous or crystalline. Here, we are referring to the crystalline form of SiO2 also known as α-quartz, not to be confused with fused quartz which is the amorphous form of SiO2.
At normal pressure trigonal quartz (α-quartz) will transform into hexagonal β-quartz at 573°C and later to cubic β-cristobalite at 1050°C. At 1705°C β-cristobalite finally melts. So if using quartz as a substrate it is advisable to stay under the β-quartz transition at 573°C.
Quartz single-crystal substrates are transparent and have excellent thermo-mechanical properties, low coefficient of thermal expansion, excellent mechanical and piezoelectric properties. Single-crystal quartz substrates are used in electronics, precision optics, laser technology, optical communications, X-ray optics and pressure sensors.
As a well studied and well-known material, SiO2 is often used to grow thin films for optical experiments however it does also support epitaxial growth of some films.Quartz single crystals are also sometimes used as targets for pulsed laser deposition to grow a dielectric layer.
If you have any questions please get in touch with us here.
Dr Joseph Franklin.
| LINEAR FORMULA: | SiO2 |
| PURITY: | >99.99% |
| CRYSTAL ORIENTATION: | (100), (110) & (111) |
| GROWTH METHOD: | Hydrothermal method |
| CRYSTAL STRUCTURE: | Hexagonal |
| LATTICE CONSTANT: | a= 4.914 Å |
| MELTING POINT (°C): | 1610 |
| THERMAL EXPANSION COEFFICIENT (/K): | perpendicular to Z axis: 13.71 parallel to Z axis: 7.48 |
| HARDNESS: | 7 |
| MOLAR MASS (G/MOL): | 60.08 |
| DENSITY (G/CM3): | 2.684 g/cm3 |
| REFRACTIVE INDEX: | 1.544 |
| DIELECTRIC CONSTANTS: | 3.7 - 3.9 |
| SIZES: | 5x5mm, 10x10 mm, 20x20 mm, 1 inch diameter, 2 inch diameter, 60 mm diameter 3 inch MgO wafers and 4 inch |
| 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 |
coming soon.
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.
What payment options do you provide? Crystal Substrates accepts the following payment methods:
- Bank Transfer into USA bank account.
- Credit Card: Visa, MasterCard, Discover, American Express, JCB, Visa Electron.
- Crystal Substrates offers a Fast Checkout option, allowing you to securely save your credit card details so that you don't have to re-enter them for future substrate purchases.
- PayPal: Shop easily online without having to enter your credit card details on the website.Your account will be charged once the order is completed.
- Sorry we do not accept payment with check.
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.
Selling to 1000+ research labs worldwide, including...
Looking for a custom substrate?... Need technical help?
Drop Us A Line
We’re happy to answer any substrate questions. To help us out let us know your preferred orientation, quantity, polishing and size requirements.
RELATED PRODUCTS
Free Shipping.
on all US orders across any product category qualify.
Payment Methods.
Credit Card: Visa, MasterCard, Maestro, American Express.
Customer Service
Email us with your questions or requirements.