Magnetostructural study of the (Mn,Fe)3(P,Si) system

Abstract

Using X-ray diffraction, DSC and magnetization measurements, a magnoestructural map of the (Mn,Fe)3(Si,P) system was assembled and reported in the current paper. Besides the already known cubic phase for Mn3-xFexSi system and the tetragonal and orthorhombic phases for the Mn3-xFexP system, a novel hexagonal phase has been observed for Mn3 xFexSi1-yPy, within the approximate range of 0.2<x<2.0 and 0.2<y<0.9. Magnetization measurements both confirm and further detail the already known properties of the Mn3-xFexSi and Mn3-xFexP systems.Comment: Paper has been accepted, reviewed and proofed for publication in the Journal of Alloys and Compounds, but is not yet publishe

Structural and Magnetic Properties of Inverse-Heusler Mn2FeSi Alloy Powder Prepared by Ball Milling

“…The FC and ZFC curves shown in Figure 8a detect l magnetization of alloys when cooled from room temperature to about 170 K. The m netic behavior is similar to that at room temperature and the magnetization curves in t temperature range (Figure 8b, 200 K) consist of a weak magnetization reversal at l magnetic fields and linear contribution at higher fields. Magnetic properties of prepared Mn 2 FeSi alloy powder are different from annealed ingots (773 K/48 h) and powders (1223 K/100 h) presented in the literature [21,28]. Both systems exhibit antiferromagnetic-paramagnetic transition at T N about 50 K. However, it can be seen from Ref.…”

“…Both systems exhibit antiferromagnetic-paramagnetic transition at T N about 50 K. However, it can be seen from Ref. [28] that an increase in the amount of Fe at the expense of Mn can significantly change the magnetic behavior of the alloy powder. For example, the system Mn 1.5 Fe 1.5 Si [28] shows antiferromagnetic-ferromagnetic-paramagnetic transitions with Néel temperature at 62 K and Curie temperature at 137 K, but the shape of the FC-ZFC curves in the ferromagnetic region is completely different from that in Figure 8a, where we suppose superposition of ferro-/ferrimagnetic and paramagnetic contributions (67-155 K).…”

“…[28] that an increase in the amount of Fe at the expense of Mn can significantly change the magnetic behavior of the alloy powder. For example, the system Mn 1.5 Fe 1.5 Si [28] shows antiferromagnetic-ferromagnetic-paramagnetic transitions with Néel temperature at 62 K and Curie temperature at 137 K, but the shape of the FC-ZFC curves in the ferromagnetic region is completely different from that in Figure 8a, where we suppose superposition of ferro-/ferrimagnetic and paramagnetic contributions (67-155 K). Thus, it seems that the final magnetic properties will depend not only on the composition of the alloy, but also on the temperature and annealing time, which is significantly shorter (1.5 h) in the currently prepared alloy powders.…”

Lattice dynamics across the magnetic transition in(Mn,Fe)1.95(P,Si)

“…The magnetic characterization in (Mn,Fe) 3 Si systems is reported in previous studies [34][35][36]. The magnetic ordering temperature in the (Mn,Fe) 3 Si system varies between 30 K in Mn 3 Si and 800 K in Fe 3 Si and depends strongly on the Mn to Fe ratio.…”

Kinetic-arrest-induced phase coexistence and metastability in(Mn,Fe)2(P,Si)

“…In all samples, about 1 wt.% (Mn,Fe) 3 Si impurity phase was detected in the x-ray patterns. Our previous studies show that the (Mn,Fe) 3 Si phase shows an antiferromagnetic transition [35]. The magnetic signal from the (Mn,Fe) 3 Si impurity phase is two orders of magnitude weaker than that from the main phase, which has a negligible influence on the magnetic results.…”