Sapphire

Product Specifications

Sapphire

Mechanical Properties
Density3.97g/cm3
Vickers Hardness20 GPa
Tensile Strength60,000 psi
Compressive Strength300,000 psi
Young’s Modulus74 x 106 psi
Poisson Ratio0.28
Thermal Properties
Melting Point2050°C
Thermal Conductivity32W/Mk (@258C)
Specific Heat1.99 J/cm3°C)
Electrical Properties 
Resistivity@25°C > 1018 ohm cm
@500°C > 1012 ohm cm
Dielectric ConstantPerpendicular to C axis 9.3 (KHz-I GHz, 25°)
Parallel to C axis 11.5 (KHz-I GHz, 25°)
Dielectric Strength480,000 v/cm
Optical Properties 
Near and Mid-wave IR transmission>86%
UV transmission>70%
Refractive Index1.83 @ 0.26 um
1.76 @ 0.63 um
1.58 @ 05.57 um
Birefringence0.0087 @ 0.55 um

 

As the second hardest material in nature after diamond, and with exceptional optical qualities, physical strength, resistance to impact, abrasion and corrosion, durability under extreme pressure and temperature, bio-compatibility and chemical inertness, sapphire is an ideal base material for deposition of semiconductor materials for manufacturing optical and electronic devices. Its ability to be fashioned into nearly any shape for a variety of applications and its electrical and material properties make it the predominant base material on which to produce LEDs, as well as the only base substrate material used in Silicon on Sapphire RFICs.

Product Specifications