Abstract
This chapter deals with the temporal evolution of twins that is investigated with the aid of computer simulation. According to the computer simulation, there are three types of twin evolutions. These twins differ in their types and characteristics from one another. The contact twin, as defined by Tamor, always grow on the (111) surface, and share the [111] direction normal to the twin surface with the parent surface, while the penetration twin grows on either (111) or (100) surface, and shares the [111] direction that is not normal to the twin's surface with the parent surface. As the shape of twin is sensitively dependent on the α-parameter, the actual α-value under given chemical vapor deposition (CVD) conditions can be estimated not only from the crystal morphology, but alsofrom the twin shape at the film surface. The pyramidal structures as often seen on the 100 faces of HOD films are identified as penetrating twins.
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