XPS research of floor oxidation of metallic carbides: Fullerenes, Nanotubes and Carbon Nanostructures: Vol 0, No 0

Summary

Metallic carbides MC (HfC, NbC, ZrC, TaC and TiC) that have been uncovered to air below the ambient temperature situation for a time period have been characterised by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), excessive decision transmission electron microscopy (HRTEM) and Raman. Recent MC samples uncovered to the air for various time (contemporary, someday, one week and one quarter) illustrated sudden oxidation diploma of the surfaces. XRD assessments offered very restricted info, because the oxidation course of occurred from the floor on the nanometer scale. Nevertheless, the XPS assessments offered extra complete info for the MO_x (HfO₂, ZrO₂, Nb₂O₅, Ta₂O₅ and TiO₂) movie and MC (HfC, NbC, ZrC, TaC and TiC) interlayer. In the meantime, the HRTEM and Raman assessments might give some further or supporting info for XPS assessments, when the samples have been uncovered to the air for longer time (one week or one quarter). In the meantime, this analysis is the primary to point out that the oxidation progress of the metallic surfaces of HfC, NbC, ZrC, TaC and TiC can happen in air below the ambient temperature situation and the oxidation movie is about 2–5 nm. In the meantime, a brand new oxidation mechanism of metallic carbides MC (HfC, NbC, ZrC, TaC and TiC) uncovered to air below the ambient temperature situation can be proposed, contemplating the obtained Raman, TEM and XPS outcomes that would clearly verify the formation of HfO₂ and free carbon.