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