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Al2O3 Sapphire single crystal is an excellent multifunctional material. It has high temperature resistance, good thermal conductivity, high hardness, infrared transmittance, and good chemical stability. Widely used in multiple fields such as industry, national defense, and scientific research (such as high-temperature infrared windows). At the same time, it is also a widely used single crystal substrate material, which is the preferred substrate for the current blue, purple, and white light emitting diodes (LEDs) and blue laser (LD) industries (requiring the epitaxial growth of gallium nitride thin films on sapphire substrates), and is also an important superconducting thin film substrate.
Product Description
Al2O3 Sapphire single crystal is an excellent multifunctional material. It has high temperature resistance, good thermal conductivity, high hardness, infrared transmittance, and good chemical stability. Widely used in multiple fields such as industry, national defense, and scientific research (such as high-temperature infrared windows). At the same time, it is also a widely used single crystal substrate material, which is the preferred substrate for the current blue, purple, and white light emitting diodes (LEDs) and blue laser (LD) industries (requiring the epitaxial growth of gallium nitride thin films on sapphire substrates), and is also an important superconducting thin film substrate.
Material Properties
Syngony | hexagonal crystal system | ||
Lattice constants | a=4.748Å c=12.97Å | ||
Density | 3.98（g/cm3） | ||
Melting point | 2040℃ | ||
Growing directions | Tira method, bubble method | ||
Mohs hardness | 9 | ||
Refractive index | At 300K, C, 1.762 @630nm ⊥C，1.770 @630nm | ||
Thermal expansion coefficient | 5.8x10-6/K | ||
Thermal conductivity (cal/℃ cm s) | ⊥c | //c | |
23℃ | 0.055 | 26℃ 0.060 | |
77℃ | 0.040 | 70℃ 0.041 | |
Loss angle tangent @ 293K | 1×10-4（1MHz） | ||
Dielectric constant *103-109Hz @ 25 ℃ | ∥C，11.5 ⊥C，9.3 | ||
Transmittance | Ø 80％@ 400~4000nm | ||
Crystallographic orientation | A-plane | <11-20> | 2.379A |
R-plane | <1-102> | 1.740A | |
M-plane | <10-10> | 1.375A | |
C-plane | <0001> | 2.165A | |
Crystallographic tolerance | ±0.5° | ||
Conventional dimensions and tolerances | 103,105,1010,1515,2015,2020 or custom-made | ||
Conventional thickness and tolerance | 0.5mm，1.0mm | ||
Polishing | Single or double-sided | ||
Surface roughness | Ra＜1nm （5×5μm） | ||
Package | 100 clean bag, 1000 ultra-clean room | ||
