It was shown that the elastic energy far from a point defect in an isotropic solid was mainly shear elastic energy. The calculation, which was based upon a standard dipole expansion, showed that less than 10% of the distant point defect energy was associated with volume changes, no matter how large or small the bulk modulus was compared to the shear modulus.

Dominance of Shear Elastic Energy far from a Point Defect in a Solid. J.C.Dyre: Physical Review B, 2007, 75[9], 092102 (4pp)