Epitaxial growth of titanium oxycarbide on MgO (0 0 1) substrates by pulsed laser deposition

Epitaxial TiC_xO_y thin films were grown on MgO (0 0 1) substrates by using pulsed laser deposition method. High-resolution X-ray diffraction and transmission electron microscopy were used to examine crystallinity and microstructure of epitaxial TiC_xO_y film on MgO. The chemical composition of the film is determined to be x ∼ 0.47 and y ∼ 0.69 by X-ray photoelectron spectroscopy. Atomic force microscopy revealed that the surface of TiC_xO_y film is very smooth with roughness of 0.18 nm. The resistivity of the TiC_xO_y film measured by four-point-probe method was about 137 μ Ω cm.