Nd. Sharp et Sh. Walmsley, THE METHOD OF HOMOGENEOUS DEFORMATIONS OF ATOMIC AND MOLECULAR-CRYSTALS - GENERAL FORMULATION AND ROTATIONAL INVARIANCES, Chemical physics letters, 222(6), 1994, pp. 546-550
The method of homogencous deformations, in which macroscopic elastic p
roperties are expressed directly in atomic terms, is developed in two
parallel ways, one specially adapted to atomic and one to molecular cr
ystals. The two are related by an unusual linear transformation. In pa
rticular, the treatment enables the consequences of rotational invaria
nce, which are straightforward for atomic crystals, to be deduced for
the case of molecular crystals.