Mechanical properties, elastic constants, lattice vibrations of Indium Arsenide (InAs)

InAs - Indium Arsenide

Mechanical properties, elastic constants, lattice vibrations

Basic Parameter
Elastic constants
Acoustic Wave Speeds
Phonon frequencies

Basic Parameter

Bulk modulus 5.8·1011 dyn cm-2
Density 5.68 g cm-3
Hardness on the Mohs scale 3.8
Surface microhardness (using Knoop's pyramid test) 430 kg mm-2
Cleavage plane {100}
Piezoelectric constant e14= -4.5·10-2 C m-2
Electron g - factor  
298 K
-17.5
80 K
-15.4

Elastic constants at 293 K

C11=8.34·1011 dyn/cm2
C12=4.54·1011 dyn/cm2
C44=3.95·1011 dyn/cm2
(Burenkov et al. [1975]).
Temperature dependences of elastic constants.
(Burenkov et al. [1975]).
For T= 200K
Bulk modulus (compressibility-1) Bs= 5.81·1011 dyn/cm2
Shear modulus C'= 1.90·1011 dyn/cm2
[100] Young's modulus Yo= 5.14·1011 dyn/cm2
[100] Poisson ratio σo = 0.35

Acoustic Wave Speeds

Wave propagation Direction Wave character Expression for wave speed Wave speed (in units of 105 cm/s)
[100] VL (C11/ρ )1/2 3.83
VT (C44/ρ )1/2 2.64
[100] Vl [(C11+C12+2C44)/2ρ]1/2 4.28
Vt|| Vt||=VT=(C44/ρ)1/2 2.64
Vt⊥ [(C11-C12)/2ρ]1/2 1.83
[111] Vl' [(C11+2C12+4C44)/3ρ]1/2 4.41
Vt' [(C11-C12+C44)/3ρ]1/2 2.13

Phonon frequencies

(in units of 1012 Hz)
νTO(Γ) 6.44 νLO (X) 6.20
νLO(Γ) 7.01 νTA(L) 1.50
νTA(X) 1.70 νLA(L) 4.46
νLA(X ) 4.94 νTO(L) 6.44
νTO(X ) 6.47 νLO(L) 6.26