Na x CoO 2 (x∼0.68) thin films were fabricated on sapphire (0 0 0 1) substrates via the lateral diffusion of sodium into Co 3 O 4 (1 1 1) films, which were grown by pulsed-laser deposition. From the results of X-ray diffraction and in-plane resistivity ρ ab , the single phase and the metallic behaviors of these Na x CoO 2 films can be identified. For the same sodium content x, ρ ab is consistent with that of single crystals. In addition, the O 1s X-ray absorption near edge spectra of thin films are measured and compared with those of single crystals.
- Lateral diffusion
- Layered cobaltates
- Na CoO thin film
- X-ray absorption spectroscopy
- X-ray diffraction