Abstract
ave been obtained by high-temperature X-ray powder diffraction study. The amorphous structure of nanosized Ni particles is stable up to 200 ℃. Ni nanocrystals are formed in the temperature range of 300–600 ℃. The sizes of the coherent scattering regions (CSR) depend on the temperature of isothermal annealing and they are in the 5–15 nm interval. The activation energy of nanocrystal growth has been estimated. It is 67.3 kJ/mol. The relationship between the unit cell parameter of nanocrystalline Ni and the size of the CSR has been determined. An increase in the CSR of Ni nanoparticles causes the increase in the cell metric.
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