Fe HYPERFINE FIELDS IN Fe3_YxSi ALLOYS
نویسندگان
چکیده
The Mossbauer spectra of Fe in Fe3 _ xVx Si alloys for 0.,;; x";; I shows that V occupies almost exclusively one of two Fe sites (the B site). As x increases the spectra of Fe on the other site (the A, C site) becomes increasingly complex as the number of their V 1st neighbors increases. Simulated Mossbauer spectra were calculated using moments obtained by a simple model from bulk magnetization and V NMR data. This model assumes a decrease in Fe(A, C) moments as the number of their Fe 1st neighbors decreases. Comparison of the Fe(B) field of the alloy with x = I to that of the alloy with x =0 gives an estimated reduction in the on site 4s electron polarization of about 100 kOe or about 0.05 unpaired 4s electrons.
منابع مشابه
Formation of magnetic characteristics and hyperfine fields in metal-metalloid alloys
Physical-Technical Institute, Ural Branch of Russian Academy of Sciences, Izhevsk, Russia This work deals with the analysis of peculiarities of formation of the hyperfine fields (HFF) at the Fe nuclei in disordered alloys metalmetalloid using the ”first-principles” calculations. Some phenomenological models and justification of their usage for the interpretation of the experimental HFF distribu...
متن کاملNuclear Gamma Resonance Study of Alloy Systems
The Ir-Fe and Ir-Ni alloy systems were studied over the whole composition range by means of the nuclear resonance absorption of the 73 keV y-rays of 193Jr and of the 14.4 keV y-rays of 57Fe. The magnetic hyperfine field at the Ir-nuclei in Ir-Ni alloys decreases approximately linearly with the Ir concentration from — 460 kOe at 4.2 K in very dilute alloys to zero at about 20 at.-% Ir. This beha...
متن کاملAbsence of magnetism in hcp iron-nickel at 11 K.
Synchrotron Mössbauer spectroscopy (SMS) was performed on an hcp-phase alloy of composition Fe92Ni8 at a pressure of 21 GPa and a temperature of 11 K. Density functional theoretical calculations predict antiferromagnetism in both hcp Fe and hcp Fe-Ni. For hcp Fe, these calculations predict no hyperfine magnetic field, consistent with previous experiments. For hcp Fe-Ni, however, substantial hyp...
متن کاملNuclear Zeeman Effect in W182 in Iron
The Mossbauer effect in the 100-keV 2+ ~ 0+ transition in W182 was observed with dilute t~ngsten in iron alloy absorbers with concentrations from 0.5-5.0 at.%W at 4.2°K. From the Zeeman spectra In external longitudinal magnetic fields, the g factor of the first excited 2+ state was found to be O.~2±0.O~, and the hyperfine field at tungsten nuclei in iron was found to be -708±25 kOe. The hyperfi...
متن کاملمحاسبه میدان مغناطیسی فوق ریز در مکان هستههای Cd ,Rh ,FeوSn در بلور کروم
The incommensurate spin -density –wave magnetism of Cr has attracted great interest since its discovery via neutron scattering. Although the existence of spin- density –wave has been confirmed by experiment but the calculations which have been carried out have not been able to predict the correct ground state magnetic phase for chromium yet. To predict the magnetic hyperfine field at nucleus ...
متن کامل