According to TEM data (Fig. ), the boron phosphide powder consists of flat polyhedral particles having dimensions from 50 to several hundred nanometers; and a significant part of them contains twins. Fig. presents TEM and HRTEM images of sphalerite BP particle containing two systems of twins. White rectangles depict stacking faults which change the layer stacking sequence from ABCABC for cubic (3C) sphalerite structure to ABABABA for hexagonal (2H) wurtzite structure.