Conclusions
Carbide formation during carburization of MoO3 microcrystalline reduction products is possible at as low as 500°C.
Depending on conditions, only hexagonal carbide polycrystal forms from the initial crystal. It inherits the morphology of the MoO2 intermediate phase (MoO3 → MoO2 → Mo → Mo2C), or is practically a carbide single crystal having a very disperse porous structure (MoO3 → suboxide → Mo2C).
Under certain regimes, an intrusion phase of the bcc molybdenum lattice forms. This is probably cubic molybdenum carbide MoC1−x, which is based on the inheritance of the initial sublattice of the molybdenum atoms in the trioxide.
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Literature cited
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Translated from Poroshkovaya Metallurgiya, No. 12 (252), pp. 90–94, December, 1983.
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Solonin, Y.M. Electron-microscope study of the interaction of carbon with the reduction products of molybdenum from the trioxide. Powder Metall Met Ceram 22, 1041–1044 (1983). https://doi.org/10.1007/BF00802437
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DOI: https://doi.org/10.1007/BF00802437