The strontium lanthanum aluminate crystal has no twins and phase transitions from the melting point to the low temperature. It has the same structure as the high-temperature superconductor YBCO. Compared with other substrates, the <001> plane has a moderate lattice mismatch with YBCO<001>. (2.5~3.5%). At the same time, the thermal expansion coefficient of this crystal is lower than that of other perovskite crystals, which can deposit films at lower temperatures to improve lattice mismatch and reduce stress.
| Main performance parameters | |
| Crystal structure | Quartet |
| Crystal growth method | Czochralski technology |
| Lattice constant | a=3.756Å c=12.63 Å |
| Melting point（℃） | 1650 |
| Density | 5.92（g/cm3） |
| Hardness | 6-6.5（mohs） |
| dielectric coefficient | ε=16.8 |
| Size | 10x3，10x5，10x10，15x15，，20x15，20x20， |
| Ф15,Ф20，Ф1″，Ф2″,Ф2.6″ | |
| Thickness | 0.5mm，1.0mm |
| Polishing | Single-sided or double-sided |
| Crystal orientation | ＜001＞ |
| Crystal plane orientation accuracy | ±0.5° |
| Edge orientation accuracy | 2°（Special requirements can reach within 1°） |
| Bevel wafer | According to specific requirements, wafers with edge-oriented crystal planes inclined at a specific angle (inclination angle 1°-45°) can be processed |
| Ra: | ≤5Å（5µm×5µm） |
| Package | Class 100 clean bag, Class 1000 super clean room |
