Formula Al2O3
Crystal Growth
Growth Method Czochralski, Kyropoulos, Stepanov
Max. Diameter (inch) Ø 4“
Crystallographic Properties
Crystal Structure
Lattice Constant (nm)
hexagonal
a = 0.4758
c = 1.2991
Physical Properties
Color colorless
Density (g/cm3) 3.98
Melting Point (K) 2325
Thermal Expansion (10-6K-1) 6.7 ǁ c, 5.0 ⊥ c
Dielectric Constant 11.5 ǁ c, 9.4 ⊥ c
Loss Tangent (@ 77K, 10GHz) 3 x 10-8ǁ c, 8.6 x 10-8 ⊥ c
Hardness (Mohs) 9