![Sample our Physical Sciences journals, sign in here to start your FREE access for 14 days]({"type":"image" , "src" : "/sda/110819/TOC-Subject-Sample-2021-Physical-Sciences.jpg"})
Abstract
Electron microscopy and diffraction have been used to study twins in annealed single crystals of α-N2. It is shown that although in principle two different types of twins may occur, only one type (a type II twin) is seen in practice. Calculations of the energies of such twin configurations and stacking faults, using lattice relaxation methods, also indicate that the energy of a type II twin which is observed in α-N2 is less than the energy of a type I twin. It is also less than the energy of various stacking faults which are not observed.