Sapphire Crystal
Sapphire single crystal (English name Sapphire, chemical formula Al₂O₃) is an excellent multifunctional crystal material. It withstands high temperatures, conducts heat well, has high hardness, transmits infrared light, and offers good chemical stability. It is widely used in industry, national defense, and scientific research, for example as high-temperature infrared windows. It is also a versatile single-crystal substrate material and is currently the preferred substrate for blue, violet, and white light-emitting diodes (LED) and laser diodes (LD), with GaN films grown epitaxially on sapphire substrates. It is also an important substrate for superconducting thin films.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Crystal System | Hexagonal Crystal System |
| Unit Cell Constants | a=4.748Å c=12.97Å |
| Density | 3.98（g/cm3） |
| Melting Point | 2050℃ |
| Mohs Hardness | 9 |
| Coefficient of Thermal Expansion | 7.5x10⁻⁶/ ᵒC |
| Thermal Conductivity -⊥c [23℃] | 0.055 卡/度•厘米•秒 |
| Thermal Conductivity -//c | 26℃ 0.060 |
| Thermal Conductivity -//c | 70℃ 0.041 |
| Thermal Conductivity -⊥c [77℃] | 0.040 卡/度•厘米•秒 |
| Dielectric Constant | 9.4 @300K at a axis and 11.58@ 300K at c axis |
| Crystal Orientation -A-plane | <11-20> |
| Crystal Orientation -A-plane | 2.379A |
| Crystal Orientation -R-plane | <1-102> |
| Crystal Orientation -R-plane | 1.740A |
| Crystal Orientation -M-plane | <10-10> |
| Crystal Orientation -M-plane | 1.375A |
| Crystal Orientation -C-plane | <0001> |
| Crystal Orientation -C-plane | 2.165A |
| Crystal Orientation Tolerance | ±0.5° |
| Standard Dimensions and Tolerances | 10×3, 10×5, 10×10, 15×15, 20×15, 20×20; customizable to customer requirements |
| Standard Thickness and Tolerances | 0.5mm，1.0mm |
| Polished | Single-sided or double-sided |
| Surface Roughness | Ra<5Å（5×5μm） |
| Packaging | Class 100 clean bag, Class 1000 cleanroom |
Datasheet
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