We offer MgAl2O4 substrates in all common sizes (up to 2 inch diameter +). Please get in touch with us if you would like a quotation for another size.
- Name: Spinel, MgAl2O4
- Commonly used as substrate for: spinels (e.g. CoCr2O4, CoFe2O4, NiFe2O4, CuCr2O4, SnFe2O4, ZnGa2O4)Perovskites (e.g. BSTO), YBCO, VOx & III-V nitride films
- Surface Roughness: Ra <0.5 nm (measured 5x5 µm AFM scan)
Magnesium aluminate (MgAl2O4) single crystals are commonly used to support the growth of other spinel films, however they are also used to make some perovskites such as BSTO and YBCO as well as III-V nitride films
MgAl2O4 is highly transparent in the visible spectrum (>85% above 300 nm). If you are planning to us in transmission experiments then please get the double sided option above. Spinel is a very hard material with a Mohs hardness of 7.5-8 with no cleavage planes so can be difficult to cleave on the benchtop with straight clean edges. We suggest to cut with a diamond saw or have us cut into the sizes you need.
The MgAl2O4 Spinel Group
Whilst here we are referring to the material which gives the spinel groups its name, it is worth mentioning here the general class of spinel materials as these are the films which are often grown on MgAl2O4 substrates / wafers. Spinel group materials have general formulation AB2X4, with the X anions (typically chalcogens, like oxygen and sulphur) arranged in a cubic close-packed lattice and the cations A and B occupying some or all of the octahedral and tetrahedral sites in the lattice. Although the charges of A and B in the prototypical spinel structure are +2 and +3, respectively (A=2+, B= 3+, X=2−), other combinations incorporating divalent, trivalent, or tetravalent cations are also possible. The anion is typically oxygen.
If you have any questions about MgAl2O4 please contact us here.
| LINEAR FORMULA: | MgAl ₂O ₄ |
| PURITY: | >99.99% |
| CRYSTAL ORIENTATION: | (100), (110) & (111) |
| GROWTH METHOD: | Czochralski |
| CRYSTAL STRUCTURE: | Cubic |
| LATTICE CONSTANT: | a = 8.085Å |
| MELTING POINT (°C): | 2130 |
| THERMAL EXPANSION COEFFICIENT (x10-6/ K): | 7.45 |
| HARDNESS (Mohs): | 8 |
| MOLAR MASS (G/MOL): | 142.27 g/mol |
| DENSITY (G/CM3): | 3.64 |
| REFRACTIVE INDEX: | 1.72 (around 550 nm) |
| DIELECTRIC CONSTANTS: | 8.5 |
| SIZES: | 5x5mm, 10x10 mm up to 2" diameter |
| 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.
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