Nanostructure and atomic ordering in vanadium carbide |
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Authors: | A A Rempel’ A I Gusev |
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Institution: | (1) Institute of Solid-State Chemistry, Urals Branch of the, Russian Academy of Sciences, 620219 Ekaterinburg, Russia |
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Abstract: | Nanostructured nonstoichiometric vanadium carbide VC0.87 was obtained in powdered form using the ordering effect. The composition, structure, and properties of the carbide were studied
by chemical and thermogravimetric analysis, gas chromatography, x-ray diffraction, optical and electronic microscopy, electron-positron
annihilation, magnetic susceptibility, and microhardness methods. Nanostructured vanadium carbide VC0.87 possesses the crystal structure of the cubic ordered phase V8C7 with space group P4332. Vanadium carbide nanocrystallites are shaped in the form of 400–600 nm in diameter and 15–20 nm thick curved petals. The
surface layer of the nanocrystallites contains defects of the vacancy agglomerate type. The microhardness of vanadium carbide,
obtained by vacuum sintering of VC0.87 nanopowder was 60–80 GPa, which is 3–4 times greater than the microhardness of coarse-grained vanadium carbide with the same
composition and close to the hardness of diamond.
Pis’ma Zh. éksp. Teor. Fiz. 69, No. 6, 436–442 (25 March 1999) |
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