In the resulting barrier heights from these possible environments shown in Tab. 3 it can again be confirmed, that in the studied systems the closer the other cations are to the diffusing cation, the higher the barrier is. However with the additional Ca atoms present in the cell further from the diffusion event, the barriers are lower than for the single atom diffusion, showing a stabilizing effect of the environment on the ease of diffusion in the cell. It is also important to note that there is a substantial reduction of the diffusion barriers for higher Ca concentrations. Similar computational results have also been found upon the Ca batteries showed similar behavior for Ca x V 2 (PO 4 ) 3 but the opposite behavior has been observed for Ca x Mn 2 (PO 4 ) 3 . This is a hint that the studied materials are indeed more suited as a solid electrolyte rather than a electrode material.