Ferro- and Antiferromagnetism of the Laves Phase Compound in Fe-Ti Alloy System

Magnetic properties of C14 Laves phase Ti(Fe1T)2 with T=Mn, Co and Ni (x⩽0.6)

“…The magnitude of the 6 h iron moments is 1.4 m B while the Fe atoms at the 2a site have no ordered magnetic moments [5]. This compound, however, shows a drastic change of magnetic properties, from an antiferro-to a ferromagnetic state, with the deviation of the composition from the stoichiometry to the Fe-excess side [4]. This suggests that ferro-and antiferromagnetic spin fluctuations coexist also in TiFe 2 .…”

“…On the other hand, among many TFe 2 -type Laves phase compounds, C14 TiFe 2 is the only stable antiferromagnet with a Ne´el temperature at room temperature [4]. In this compound Fe atoms at 6 h sites have magnetic moments antiparallel between neighboring 6 h planes and parallel in a 6 h plane.…”

On the ternary Laves phases {Sc,Ti}2M3Si (M=Cr, Mn, Fe, Co, Ni) with MgZn2-type

“…ScMn 2 and TiMn 2 crystallize in the C14 Laves phase at low temperatures with the enthalpies of formation of −18.5[32] (calorimetric experiment, −15.8 ± 2.5[46]) and −29.6[34] (calorimetric experiment, −28.9 ± 2.3[34]) kJ/mol of atoms, respectively. Si substituting Mn in Sc 2 Mn 3 Si and Ti 2 Mn 3 Si still retains the C14 structure together with significantly more negative enthalpies of formation in comparison to the corresponding binary parent Laves phases.Experimental investigations demonstrated that ferromagnetic ScFe 2 (T c = 540 K[47]) and antiferromagnetic TiFe 2 (T N ≈ room temperature[48]) crystallize in the C14 structure. For ScFe 2 , the local magnetic moment per Fe is 1.4 B[47], whereas for TiFe 2 the local moment per Fe is ±1.4 B for the 6h Fe site and no local moment at the 2a Fe site…”

The isothermal section of the Ti–Co–Zr ternary system at 773 K

“…[9] found only c-TiCo 2 to be stable. Many other groups found both variants [10][11][12][13][14][15]. The (␣Co) solid solution undergoes an allotropic martensitic transformation to form (Co) after cooling [16].…”