Calculation of elastic nonlinearity parameter in crystals with different chemical bonds

Definition of the new elastic nonlinearity parameter /spl gamma/ has been carried out. The computer calculations of /spl gamma/'s anisotropy for more then sixty crystals with all chemical bonding types and with any symmetry have made. The definite correlation between /spl gamma/ values and chemical bonding types in crystals investigated has been found. Some peculiarities of results obtained have been marked.