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Nanocrystalline powders with average particle sizes of 20 to 40 nm are obtained via the high-energy milling of microcrystalline TaC powder. The phase composition, morphology, specific surface area, and particle size of nanopowders are analyzed by means of X-ray and laser diffraction, SEM, and BET. The experimental dependence of the concentration of oxygen in nanopowders on their specific surface area...