Where C is the concentration of mobile ions, q is the charge of those ions, k the Boltzmann constant, T the temperature and the self-diffusion coefficient is given by D * and takes into account the attempt frequency (1 × 10 13 Hz), the hop distance (2.67Å 41 ) and the migration barrier, E m (0.34eV 29 ). In their work they showed that undoped Li 3 OCl expects values of ∼ 10 -10 S cm -1