FormulaAl2O3
Crystal Growth
Growth MethodCzochralski, Kyropoulos, Stepanov
Max. Diameter (inch)Ø 4“
Crystallographic Properties
Crystal Structure
Lattice Constant (nm)
hexagonal
a = 0.4758
c = 1.2991
Physical Properties
Colorcolorless
Density (g/cm3)3.98
Melting Point (K)2325
Thermal Expansion (10-6K-1)6.7 ǁ c, 5.0 ⊥ c
Dielectric Constant11.5 ǁ c, 9.4 ⊥ c
Loss Tangent (@ 77K, 10GHz)3 x 10-8ǁ c, 8.6 x 10-8 ⊥ c
Hardness (Mohs)9