Search

The aim of this work is to study the influence of the coexistence of different ordered structures on the evolution of the magnetism in the order-disorder transition produced by crushing and mechanical milling in the intermetallic Fe 70 Al 30−x Si x alloys. First, XRD measurements show that the three ordered samples have both D0 3 and B2 structures simultaneously and that the disordering process takes place in two stages. In the first one the D0 3 structure starts to disorder and in the second one, once the D0 3 structure has almost disappeared, the B2 starts to disorder. Second, Mössbauer spectroscopy and magnetic measurements show that there is an enhancement of the magnetic properties related to the structure change and to the increase of the lattice parameter in the order-disorder transition. The change of the magnetic behaviour is linked to the disordering of B2 structure in these alloys. [ABSTRACT FROM AUTHOR]

The main aim of this work is to study the influence of silicon/aluminium ratio in the structural and magnetic properties of ordered FeAlSiSi alloys by means of X-ray diffraction, Mössbauer spectroscopy and magnetic (SQUID) measurements. [ABSTRACT FROM AUTHOR]

Abstract: We have used Mössbauer spectroscopy and X-ray diffraction to study the influence of Si addition to Fe75Al25, Fe70Al30 and Fe60Al40 compositions without changing the iron content of the alloy. Si/Al substitution in Fe–Al–Si alloys changes the magnetism of the alloys. Depending on the Fe composition this change can be very drastic. Fe–Al alloys around 30at.%Al compositions show a very interesting magnetic behaviour that changes drastically by addition of Si. Both alloys have similar cubic structures; therefore, this study is useful to understand the magnetism of Fe–Al alloys. [Copyright &y& Elsevier]

Disordered Fe70Al30 alloy was measured versus annealing temperature by X-ray diffraction, differential thermal calorimeter, magnetization and Mo¨ssbauer spectroscopy. All of them show a critical behaviour around 475 K. The critical behaviour is related to an ordering of the alloy that happens at that temperature linked to a decrease of the magnetic properties of the sample. [Copyright &y& Elsevier]

Abstract: We have used Mössbauer spectroscopy and X-ray diffraction to study the influence of different Al/Si ratios on the structural and magnetic properties of the mechanically deformed Fe60Al40− x Si x alloys. The results indicate that ternary alloys also present the magnetic transition with disordering observed in binary Fe60Al40 alloys. Besides, Si introduction has two opposite contributions. From a structural point of view, hinders the disordering process, but, from a magnetic point of view promotes the magnetic transition. [Copyright &y& Elsevier]