Аннотация:Microstructure of boron subphosphide B12P2 produced by selfpropagated hightemperaturesynthesis has been studied by highresolution transmission electron microscopy. Two systems of twins havebeen found i.e. conventional twins on the (0003)h plane and nanotwins resulting from duplication of therhombohedral unit cell of B12P2 along one of the basic vectors