Neutron Diffraction Study of Microstructure of Nanocrystalline Cubic Niobium Carbides ...

By using time-of-flight (TOF) high resolution neutron diffraction, the microstructure of nanocrystalline nonstoichiometric niobium carbides NbC0.77, NbC0.84, and NbC0.96 powders generated by high-energy ball milling was examined. The diffraction patterns were acquired utilising the TOF mode of data gathering on the high resolution Fourier diffractometer HRFD. The microinhomogeneous structure of the nanocrystalline ball-milled powders may be detected, with two fractions with differing particle size and composition. The average diameters of coherent scattering zones and microstrains in nanocrystallites have been calculated, taking into account the anisotropy of deformation distortions. It has been demonstrated that TOF neutron diffraction patterns can provide extremely accurate data for nanocrystalline powder microstructure investigation.

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