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Sapphire
Sapphire (Al2O3) single crystal is an excellent multi-functional substrate material with their special properties, such as stand high temperature, high hardness, good thermal conductivity, superior mechanical properties and excellent light transmission etc. It is widely used in blue LED and LD devices. It is also used in superconductor devices and UV&
IR optics.
Typical Physical Properties |
molecular Formula |
Al2O3 |
Crystal Structure |
Hexagonal a=4.758 Å c=12.992 Å |
Orientation |
（0001）- c plane:2.165 Å
（11-20）- a plane:2.379 Å
（1-102）- r plane:1.740 Å
（10-10）- m plane:1.375 Å |
Crystal Purity |
> 99.99% |
Density |
3.98g /cm3 |
Melt Point |
2040oC |
Thermal Expansion |
7.5(×10-6/oC) |
Specific Heat |
0.10（cal/oC） |
Dielectric Constant |
~ 9.4 @300K at A axis
~ 11.58@ 300K at C axis |
Loss Tangent at 10 GHZ |
<2× 10-5at A axis, <5×10-5 at C axis |
Hardness |
9 (
Mohs) |
Standard Size |
Dia.3＂× 0.5mm
Dia.2＂× 0.33~ 0.5mm
20 × 20 × 0.5mm
10 × 10 × 0.5mm
Special size and orientation are available upon request. |
Orientation Accuracy |
±0.3o |
Polishing
& Micro Roughness |
Single or double sides polished Ra<5 Å |
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