There has been an interesting and long debate on the nature of ionic conductivity in these materials. Therefore, detailed studies have been carried out on the LNO material and its transport properties are well understood. There is broad agreement regarding the dominant participation of interstitial oxygen atoms in ionic conductivity . The neutron diffraction studies by Demourgues et al. predicted that interstitial oxygen atoms are accommodated by the LaO rock salt layer . This was further confirmed by Jorgensen and co-workers and they determined the location of the oxygen interstitial site to be at ( ) in the Fmmm structure.