The semiconductors of significant technical importance are elemental semiconductors, binary semiconductors and ternary semiconductors. Of these semiconductor groups, the following pure unalloyed or reinforced compounds were chosen: Si, Ge, Ga from the elemental semiconductors, GaAs, SiC, CdTe of the binary semiconductors and AlGaAs, GaAsP of the ternary semiconductors. Note that the ternaries chosen are based on GaAs. The purpose of this book is to present the mechanical properties of these structural materials irrespective in what shape, size or production method they are fabricated or what application they are intended. The extensive use of semiconductors and their variety does not permit to explore their various applications