Positron studies of polycrystalline TiC

The mean positron lifetime tau , positron diffusion length L, and the positron and electron work functions ( phi + and phi -) for polycrystalline TiC have been experimentally determined. The results were tau =160(2) ps, L+=138(27) nm and phi -=3.96(0.08) eV; phi + was shown to be almost certainly positive. These results strongly support the suggestion from recent first-principles electronic structure and positron state calculations that …