The periodicity in translation of Ag (0 0 1) and (1 1 0) twist grain boundary

The energies of Ag (0 0 1) and (1 1 0) twist grain boundary (GB) in translation have been calculated with the modified analytical embedded atom method (MAEAM). The energy period corresponds exactly to the DSC lattice unit cell and the area of the energy period referred to the CSL unit cell is 1/Σ2. The 'energy grooves' are parallel to the sides of the CSL or DSC lattice unit cell. The most preferable sliding direction is parallel to identical sides of the square CSL unit cell for (0 0 1) boundaries and to the short side of the rectangular CSL unit cell for (1 1 0) boundaries. From energy minimization, the stable configuration appears when two adjacent grains are translated relatively to the corners, centre or sides' midpoint of the DSC lattice unit cell.