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Tungsten (α-W and β-W modifications) and various tungsten carbides (W2C, WC1−x, WC) coatings were formed by chemical vapor deposition (CVD) in WF6, C3H8, H2 gas reactions. The structure of reaction products was studied by transmission electron microscopy and X-ray diffraction. The microhardness of coatings was determined by Vickers method. The mechanism of the CVD process is proposed to explain the...
Manganese(II,III) oxide (Mn3O4) with various shapes including square prisms, polyhedra and tetragonal bipyramids are selectively synthesized with the mediation of fatty acids at nanoscale (<20 nm). Among all nanostructures, Mn3O4 tetragonal bipyramids show the largest gravimetric capacitance of 304 F g−1 with excellent rate capability and long-term cycling stability. In contrast, Mn3O4 polyhedra...
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