Table 1 Comparison of physical properties between w-ZnO and w-GaN.
Properties | w-ZnO | w-GaN |
|---|---|---|
Lattice type | wurtzite | wurtzite |
Lattice constants (Å) | a = 3.25; c = 5.2158 | a = 3.19; c = 5.1959 |
Atomic mass (a.m.u.) | 65.4 (Zn); 16.0 (O) | 69.7 (Ga); 14.0 (N) |
Density (g/cm3) | 5.61 | 6.15 |
Volumetric heat capacity (kJ/m3K) | 2900 | 2800 |
Average speed of sound (m/s) | 2760 (transverse); 6090 (longitudinal)60 | 4140 (transverse); 7885 (longitudinal)61 |
Largest 2nd order constants (eV/Å2) | 12.15 | 17.50 |
Elastic constants (GPa) | E11 = 210; E12 = 121; E13 = 105; E33 = 211; E44 = 4360 | E11 = 390; E12 = 145; E13 = 106; E33 = 398; E44 = 10562 |
Phonon frequency gap (THz) | 3.98 | 6.11 |
