Abstract High-energy ball milling of Fe–Mn elemental powder mixtures has been carried out for different Mn concentrations, ranging from 0 to 90%. Mössbauer spectroscopy of 57Fe and perturbed angular correlations with 111In – implanted at 400 keV into pills made from the milled powders – have been used to investigate the structure of the milled samples. Clear changes of the hyperfine spectra occur at Mn concentrations of 15–20% and above 70%, indicating extended concentration ranges of α-Fe and γ-Fe(Mn), compared to the equilibrium phase diagram. Detailed information on additional lower hyperfine fields due to nearest neighbor Mn atoms has been obtained in the α-Fe phase containing up to 20% Mn . nanocrystalline material - ball milling - satellite magnetic field - PAC - Mössbauer spectroscopy
Hyperfine study of mechanically alloyed Fe-Mn systems
MADDALENA, AMEDEO;PRINCIPI, GIOVANNI
2001
Abstract
Abstract High-energy ball milling of Fe–Mn elemental powder mixtures has been carried out for different Mn concentrations, ranging from 0 to 90%. Mössbauer spectroscopy of 57Fe and perturbed angular correlations with 111In – implanted at 400 keV into pills made from the milled powders – have been used to investigate the structure of the milled samples. Clear changes of the hyperfine spectra occur at Mn concentrations of 15–20% and above 70%, indicating extended concentration ranges of α-Fe and γ-Fe(Mn), compared to the equilibrium phase diagram. Detailed information on additional lower hyperfine fields due to nearest neighbor Mn atoms has been obtained in the α-Fe phase containing up to 20% Mn . nanocrystalline material - ball milling - satellite magnetic field - PAC - Mössbauer spectroscopy
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