(Jahne and Ulrici [1980]).
| Bulk modulus | (7.1+1.7x)·1011 dyn/cm2 |
| Density | 4.81-0.67x g/cm3 |
| Hardness | ~5 on the Mohs scale |
| Surface microhardness (using Knoop's pyramid test) | x=0 460 kg/mm2 |
| x=1 850 kg/mm2 | |
| Piezoelectric constant | e14= -(0.035+0.065x) C m-2 |
| Bulk modulus (compressibility-1) | Bs = (7.11+1.71x)·1011 dyn/cm2 |
| Shear modulus | C' = (2.25+1.67x)·1011 dyn/cm2 |
| [100] Young's modulus | Yo= (6.11+4.19x)·1011 dyn/cm2 |
| [100] Poisson ratio | σo = 0.36-0.05x |
| Wave propagation Direction | Wave character | Expression for wave speed | Wave speed (in units of 105 cm/s) |
| [100] | VL | (C11/ρ)1/2 | 4.58+1.25x |
| VT | (C44/ρ)1/2 | 3.08+1.04x | |
| [100] | Vl | [(C11+Cl2+2C44)/2ρ]1/2 | 5.08+1.35x |
| Vt|| | Vt||=VT=(C44/ρ)1/2 | 3.08+1.04x | |
| Vt⊥ | [(C11-C12)/2ρ]1/2 | 2.16+0.92x | |
| [111] | Vl' | [(C11+2C12+4C44)/3ρ]1/2 | 5.23+1.40x |
| Vt' | [(C11-C12+C44)/3ρ]1/2 | 2.51+0.95x |
|
Compositional dependences of longitudinal (dashed lines) and transverse (solid lines) phonon frequencies (Jahne and Ulrici [1980]). |
| ωLO(GaP - like) | 404.99-38.97x-18.18x2 cm-1 |
| ωLO(InP - like) | 394.59-80.36x+30.26x2 cm-1 |
| ωTO(M) | 368-88.95x+26.04x2 cm-1 |
| ωTO(m) | 3.95.02-54.26x+6.72x2 cm-1 |
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