Abstract
The values of the third-order elastic stiffness constants ${c}_{\mathrm{IJK}}$ contain contributions not only from the anharmonic components of the interatomic potentials but also from the use of Lagrangian strain and from the harmonic (Hooke's law) components under finite deformation. The contribution from Lagrangian strain is general, while the finite-deformation contribution depends on the structure of the crystal. These harmonic components are calculated for some group IV and III-V tetrahedral semiconductors within a valence force-field model.
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