Specific features of the local atomic structure of a Fe-Si alloy in the α area of the phase diagram

Hyperfine magnetic field at Si nuclei in Fe-Si alloys

“…Using first-principles calculations we obtain the Si HFF as a function of the environment farther than the second CS, tune in accordance the results of NMR experiment at Si and Fe nuclei in [1] and the Mossbauer experiment at Fe nuclei in [9,10], make a justification of the phenomenological models of the HFF description in Fe-Si alloys which can be used for interpretation of experiments like in [4].…”

“…We think that namely the wrong determination of the III CS coefficient prevented from correct ascribing subspectra to peculiarities of the structure of alloys under study and defaced the whole approach. For example, in a recent paper [4] devoted to the local atomic structure of the Fe-Si alloys studied by Mossbauer spectroscopy, the subspectra with the hyperfine field higher than that of pure iron (about 34 T) have been ascribed to one and two Si atoms in the third CS ([0 0 1] and [0 0 2] environments). And, again, authors have not been able to make any structural conclusions from the intensities of the subspectra, which, in our opinion, is a consequence of erroneous interpretation.…”

“…Proper account of the correct sign of the Si HFF allows us to find the origin of contradiction between experiments in [1] and [9,10]. The corrected model of the Fe HFF formation should be taken into account for attributing nuclear resonance subspectra to atoms in certain local environments in experiments like [4].…”

“…Their magnetic properties and peculiarities of chemical ordering are an object of research of many scientific groups. In spite of a long history of study of these alloys (for example, [1][2][3][4]) some questions related with the local properties remain unclear. Suitable experimental methods to study local properties are nuclearresonance methods which combine a wide applicability with a simple usage and high precision of measuring the hyperfine interaction (HFI).…”

Ближний порядок в магнитомягком сплаве alpha-FeAl

“…Результаты исследова-ний локальной структуры кристаллов железо-кремний, содержащих от 5 до 10 at.% Si, с помощью рентге-новской дифракции и ЯГР-спектроскопии приведены в работах [54][55][56][57]. Впервые показано, что для всех кон-центраций кремния характерно ближнее упорядочение B2-типа в ОЦК-решетке сплавов, которое в случае x ≥ 0.08 сосуществует с кластерами D0 3 -фазы.…”