CrystallineSystem

Orthorhombic

Tetragonal

Lattice Constant

a=5.406Å
b=5.012Å
c=6.379 Å

a=5.17 Å
c=6.26 Å

Lattice mismatchTo GaN

0.2% at (001)ori.

1.4%at (001)ori.

Melting Point

1600^oC

1900^oC

Density

4.18 g/cm³

2.62 g/cm³

Mohs hardness

7.5