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Horizontally Directed Crystallization Grown Sapphire Wafer 4inch 0.5mm C-Axis Epi-Ready
Single crystal sapphire Al2O3 possesses a unique combination of
excellent optical, physical and chemical properties. The hardest of
the oxide crystals, sapphire Al2O3 retains its high strength at
high temperatures, has good thermal properties and excellent
transparency. Sapphire Al2O3 optics is chemically resistant to many
acids and alkalis at temperatures up to 1000 degrees C as well as
to HF below 300 degrees C. These properties encourage its wide use
of Sapphire Al2O3 optics in hostile environments where optical
transmission in the range from the visible to the near infrared is
required.
Now the majority of crystals are growing from liquid melt. The most
suitable substances to grow crystal from a melt have to melt
without decomposition, have no polymorphic transitions and are
characterized by low chemical activity. The crystallization process
from a melt is applied in the most widespread methods of
monocrystalline sapphire growth: namely, the Horizontally Directed
Crystallization (HDC) method and Stepanov's method.
OPTICAL PROPERTIES
Transmission | 0.17 to 5.5 um |
Refractive Index | 1.75449 (o) 1.74663 (e) at 1.06 um |
Reflection Loss | at 1.06 microns (2 surfaces) for o-ray - 11.7%; for e-ray - 14.2% |
Absorption Index | 0.3 x 10-3 cm-1 at 2.4 um |
dN/dT | 13.7 x 10-6 at 5.4 um |
dn/dm = 0 | 1.5 um |
PHYSICAL PROPERTIES
Density | 3.97 g/cm3 |
Melting Point | 2040 degrees C |
Thermal Conductivity | 27.21 W/(m x K) at 300 K |
Thermal Expansion | 5.6 x 10 -6 /K (parallel C-axis) & 5.0 (perpendicular C-axis) x 10 -6 /K |
Hardness | Knoop 2000 kg/mm 2 with 2000g indenter |
Specific Heat Capacity | 419 J/(kg x K) |
Dielectric Constant | 11.5 (parallel C-axis) 9.4 (perpendicular C-axis) at 1MHz |
Young's Modulus (E) | 335 GPa |
Shear Modulus (G) | 148.1 GPa |
Bulk Modulus (K) | 240 GPa |
Elastic Coefficients | C11=496 C12=164 C13=115 |
Apparent Elastic Limit | 275 MPa (40,000 psi) |
Poisson Ratio | 0.25 |
Acceptance Check
1. The product is fragile. We have adequately packed it and labeled it fragile. We deliver through excellent domestic and international express companies to ensure transportation quality.
2. After receiving the goods, please handle with care and check whether the outer carton is in good condition. Carefully open the outer carton and check whether the packing boxes are in alignment. Take a picture before you take them out.
3. Please open the vacuum package in a clean room when the products are to be applied.
4. If the products are found damaged during courier, please take a picture or record a video immediately. DO NOT take the damaged products out of the packaging box! Contact us immediately and we will solve the problem well.
