Abstract
The oxidation of polycrystalline Mo plates and of Mo(100), Mo(110), and Mo(111) single-crystal plates in pure oxygen at 8 × 104 and 2.7 × 103 Pa, at 743–1023 K leads to the growth of orthorhombic MoO3 only, as shown by X-ray diffraction and SEM observations. The stable oxides MoO2 and Mo4O11 were not identified. At each side of the molybdenum plate, the oxide scale is a stacking of MoO3 crystals with their [100] axes oriented normal to the surface of the initial Mo plate. The MoO3 crystals are very thick in the [010] direction, compared with the well-known shape of the MoO3 crystals grown from the vapor phase. Two main factors determine the oriented growth of MoO3 crystals from Mo oxidation. A growth mechanism involving a structural rearrangement of the Mo atoms at the reactional interface and oxygen diffusion through the oxide is proposed.
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Floquet, N., Bertrand, O. & Heizmann, J.J. Structural and morphological studies of the growth of MoO3 scales during high-temperature oxidation of molybdenum. Oxid Met 37, 253–280 (1992). https://doi.org/10.1007/BF00665191
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DOI: https://doi.org/10.1007/BF00665191