The atomic structure and surface energies of several low-index surfaces (0001), (11¯00) (112¯0) Ti5Si3 in dependence on their termination were calculated by the projector augmented-wave method within density functional theory. It was revealed that mixed TiSi-terminated (0001) is stable wide range change Ti chemical potential. However, Ti-terminated Ti5Si3(0001) slightly lower energy Ti-rich lim...