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SrLaAlO4 crystal is a promising substrate material for high Tc superconduct film and other oxide films to replace SrTiO3 crystal with better quality and lower cost.
MTI produces SrLaAlO4 crystal and substrate in house up to 35 mm.
We strongly recommend to customers to use SrLaAlO4 substrate instead of SrTiO3, if possible, to improve expitaxy film quality.
Please see the table below for comparison of SrTiO3 - LaAlO3 - SrAlO4 Crystal.
| Properties/Crystal |
SrTiO3 |
LaAlO3 |
SrLaAlO4 |
|---|
| Structure |
Cubic |
Cubic at >435 oC |
Tetragonal |
| Lattice Constant |
a=3.905 |
a=3.821 A |
a=b=3.756 A c= 12.630 |
| mismatch to YBCO a=3.9 |
+0.12% |
-2.0% |
-3.7% |
| Dielectric Constant |
~ 300 |
~ 25 |
~ 17 |
| Grown Method |
Vernuil |
CZ |
CZ |
| Melting point oC |
2100 |
2080 |
1650 |
| Density |
5.175 g/cm3 |
6.52 g/cm3 |
5.92 g/cc |
| Max. Crystal size |
30 mm dia. |
75 mm dia |
35 mm dia |
| Crystal quality |
Wide rocking curve due to dislocation density |
Visible twin due to phase transition around 400 oC |
Narrow rocking curve, no twins, less defects |
| Crystal cost |
Higher |
Lower |
Medium |
Pleasse click here to download more technical data for SrLaAlO4 crystal.
Please click here for the AFM of SrLaAlO4.
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