LaAlO
3 single crystal has a lattice constant (a=3.790 Å) which
fits high Tc superconductive material (such as YBCO: 3.86 Å) very well, proper
dielectric constant and low dielectric loss in microwave band, so it is suitable
for high Tc microwave electronic devices (for example high Tc superconductive
filter in mobile communication). It is grown by Czechrolsky method, possible to
get large size (2”and 3” in diameter) and high quality crystal and substrate. It
is an important substrate that has been applied in communication industry.
Crystal structure |
Triclinic 3 m Peroviskite |
Cell parameter |
a =12.376Å α=90°5'''' Pseudo-cubic |
Melting Point |
2373°K |
Density |
6.52 g/cm3 |
Specific Heat |
0.427J/g∙k (298°K) |
Thermal conductivity |
11.6W/m∙k (300°K) |
Theramal expansion |
9.18x10-6k-1 (940°K) |
Dielectric constant (εr) |
24(295°K) 23.7(80°K) (18-35GHz) |
Dielectric loss (tgδ) |
6x10-6(80°K) Microwave |
Hardness (Mohs) |
6.5 |
Growth Method |
Czockralski |
Standard Size: Ф3″,Ф2″,Ф1″, 20x20, 10x10, 10x5, 10x3mm or
customer design.
Thickness: 0.5mm,1.0mm.
Thickness tolerance:±0.02mm or 0.005mm for special order;
Polish: one or two sides
Orientation: <100> <110> <111>
Orientation accuracy: ±0.5°
Edge Orientation accuracy: 2° (or 1°for special order)
Cut with special tilt angle: available(tilt angle:1°-45°)
Micro roughness Ra: ≤5Å(5μm×5μm)