Experimental Study of Mo03 Electrical Conductivity Changes under Low Oxygen Pressures
Mo03 forms a series of non-stoichiometric oxides on heat treatment in vacuum or in reducing atmospheres, and the departure from stoichiometry is generally associated with the formation of colour centers. The basic mechanism leading to colour center formation has been suggested to be the trapping of electrons at molybdenum (Mo5+) sites in the vicinity of oxygen vacancies. Owing to the simple description of the MoO3 structure (M0O6 octahedra linked by sharing corners) Kihlborg, Magneli, Bursill (1–3) have shown that the suboxides structures can be deduced from that of MoO3 by shear transformations. These latter can explain the discrete values of the composition range MoO3-X such as MonO3n-1 (Mo4O11, Mo5O14…) MonO3n-2 (Mo18O52) and MonO3n-m+1 (Mo17O47).
KeywordsOxygen Vacancy Oxygen Pressure Reflexion High Energy Electron Diffraction Relative Conductance Molybdenum Trioxide
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