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- W2019972141 abstract "Three samples of passivated ultrafine iron carbide particles, synthesized by laser induced pyrolysis of gaseous precursors were examined by in-situ high temperature XRD during and after high temperature (600°C) treatment under UHP He atmosphere. The results indicated that the particles sintered around 400°C, with the preservation of the carbide structure dependent on the precursor composition and the amount of retained oxygen from passivation and synthesis. Transformation of the carbide to α-Fe around 400°C was dependent on the precursor purity, temperature and type of gaseous exposure. Preservation of the carbide structure on heating was dependent on the purity of the carbide, and the concentration of oxygen and carbon in the particles. A topotactic transformation from Fe7C3 to Fe0.98O was observed in the case of samples studied under UHP He, which was absent in the other two treatments and is discussed relative to the as-synthesized/passivated particles composition and structure. This topotaxy leads to the selective formation of γ-Fe2O3 from specific ultrafine particle carbides when treated with UHP He." @default.
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- W2019972141 title "In-situ high temparature X-ray diffraction studies of nanocrystalline iron carbides" @default.
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- W2019972141 doi "https://doi.org/10.1016/0965-9773(94)90130-9" @default.
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