Magnesium oxide (MgO) single crystal substrates are widely used in many thin film technology fields. Such as the production of magnetic films, semiconductor films, optical films and high-temperature superconducting films. Because the dielectric constant and loss of MgO single crystal in the microwave band are very small, and large-area substrates (2 inches in diameter and larger) can be obtained, it is an important high-temperature superconducting thin-film single crystal substrate for the current industrialization. one. It can be used to make high-temperature superconducting microwave filters and other devices required by mobile communication equipment, and has a large realistic and potential application market.
| Main performance parameters | |
| Crystal growth method | Special Arc Melting |
| Crystal structure | Cube |
| Lattice constant | a=4.130 Å |
| Melting point（℃） | 2800（℃） |
| Purity | 99.95% |
| Density（g/cm3） | 3.58（g/cm3） |
| Hardness | 5.5（mohs） |
| Coefficient of thermal expansion | 11.2x10-6（/℃） |
| Cleavage plane | <100> |
| Optical Transmission | >90%（200~1000nm） |
| Dielectric constants | ε= 9.65 |
| thermal conductivity | 36 W/m.k @ 300°K |
| Size | 5x5，10x10，20x20，30x30mm ,Ø50.8 mm |
| Thickness | 0.5mm，1.0mm |
| Polishing | Single-sided or double-sided |
| Crystal orientation | <001>, <110>,<111> |
| Crystal plane orientation accuracy | ±0.5° |
| Edge orientation accuracy | 2°（Special requirements can reach within 1°） |
| Ra: | ≤5Å（5µm×5µm） |
| Package | Class 100 clean bag, Class 1000 super clean room |
