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- W2345850252 abstract "The diffusion trapping model has been employed to calculate mean lifetime of positrons (τ¯) as a function of grain size and temperature in Fe-B-Si and Fe2O3 nanocomposites. The mechanism of positron annihilation in ferrite nanocomposite alloys has been discussed in terms of diffusion of positrons inside the grain boundaries and thermal vacancies. The decrease in τ¯ with increase in the size of the grains is due to the fact that the density of grain boundary decreases gradually as the grain grows thus reducing the trapping centers. The calculations are done for two different temperature regions, low and high temperatures. The calculations of τ¯ shows that at low temperature τ¯ decreases with temperature. While the same increases with the temperature in the high temperature region. This increase in τ¯ has been ascribed to the increase in the number of thermally generated vacancies at higher temperatures. Ferrite based alloys shows a strong segregation at grain boundaries occurs, which stabilizes the nanostructure and leads to a decrease of the grain boundary diffusivity and diffusion is closely linked with thermal defect formation. Thus, information regarding thermal vacancies concentration in nanocrystallites could be obtained from positron lifetime data." @default.
- W2345850252 created "2016-06-24" @default.
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- W2345850252 date "2016-01-01" @default.
- W2345850252 modified "2023-10-12" @default.
- W2345850252 title "Vacancy type defect study in Fe-B-Si and Fe2O3 nanocomposites alloys by diffusion trapping model" @default.
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- W2345850252 doi "https://doi.org/10.1063/1.4946181" @default.
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