Abstract
The defect structure of tungsten powders was examined using the method of angular distribution of annihilating photons. The method of measuring the angular correlation spectra is described. Two models were analyzed to ensure the adequate description of the experimental data: a model based on one Gaussian component and a model based on the superimposition of the Fermi and Gaussian components. The integral parameters were also calculated. It was found that the width reduction of the angular distribution curve in the transition from low-dispersion to high-dispersion powders was caused by an excess concentration of vacancies. The higher vacancy concentration of the high- dispersion powders is one of the reasons for their high chemical activity and is also reflected in the processes of electric, heat, and mass transfer in compacts of high-dispersion powders.
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