Mechanical Properties
Density: 3.97g/cm3
Vickers Hardness ∥ to c-axis: 1940
Vickers Hardness ⊥ to c-axis: 2200
Tensile Strength: 60,000 psi
Compressive Strength: 300,000 psi
Young’s Modulus: 74 x 106 psi
Poisson Ratio: 0.28
Thermal Properties
Melting Point: 2050°C
Thermal Conductivity: 32W/Mk (@258°C)
Specific Heat: 1.99 J/cm3°C)
Electrical Properties
Resistivity: @25°C > 1018 ohm cm
@500°C > 1012 ohm cm
Dielectric Constant: Perpendicular to C axis 9.3 (KHz-I GHz, 25°)
Parallel to C axis 11.5 (KHz-I GHz, 25°)
Dielectric Strength: 480,000 v/cm
Optical Properties
Near and Mid-wave IR transmission: >86%
UV transmission: >70%
Refractive Index: 1.83 @ 0.26 μm
1.76 @ 0.63 μm
1.58 @ 05.57 μm
Birefringence: 0.0087 @ 0.55 μm
