Nanotwinning in boron subphosphide B12P2.

Microstructure of boron subphosphide B12P2 produced by self-propagated high-temperature synthesis has been studied by high-resolution transmission electron microscopy. Two systems of twins have been found i.e. conventional twins on the (0003)h plane and nanotwins resulting from duplication of the rhombohedral unit cell of B12P2 along one of the basic vectors.