Electronic structure of 3d transition metal solutes in liquid aluminium

Abstract

The changes in the electrical resistivity, the thermoelectric power and the magnetic susceptibility of liquid Al due to the addition of small amounts of Ti, V, Cr, Mn, Fe, Co and Ni (1 at.%) are discussed. The variation of the residual resistivity across the series exhibits a characteristic two-peak shape in contrast to the single peak of the solid state. The analysis of the position and the width of the virtual bound d states and the pronounced increase of the magnetic susceptibility point to a magnetically split band structure in the middle of the series. Impurities of Cr and Mn are indicated to be magnetic. V and Fe are presumably on the borderline, whereas Ti, Co and Ni are definitely nonmagnetic if dissolved in liquid Al.

Magnetic properties of liquid Ti–Si, V–Si and Cr–Si alloys

“…When Cr, Mn and Fe solutes are added into liquid metal solvents such as liquid Cu, Zn, In and Sn [5,11], the impurities are in the magnetic state in these liquid metals. In liquid Al solvent, however, the Cr, Mn and Fe ions are in the non-magnetic state as has been reported by Flynn et al [3] and has been discussed in detail by Terzieff and co-workers [12,13]. In this work and the previous study [2], we have found a non-magnetic behavior of Cr, Mn and Fe ions in the wide composition range up to 50 at.% Cr, 40 at.% Mn and 50 at.% Fe for liquid Cr-Si, Mn-Si and Fe-Si, respectively.…”

Average replicated T-matrix approximation: valence band of non-crystalline metallic alloys

“…So, in work [24], this hypothesis was proved experimentally for diluted Ni-Al alloys (the host metal was Al).…”

“…range of energy (this is correct for small fraction of Ni) the effect of resonance should be definitely smaller than its maximum value because the corresponding Fermi energy is located near the beginning of d-band (left hill of the resonance). At the same time, the dependence of DoS on the fraction of transition metal in an alloy with non-transition metal for both large and small fraction of the transition metal cannot be in direct proportion to these fractions (experimentally shown in [24]). The dependence of DoS on the fraction of Mn-Ti alloy is similar to the case of Al-Ni alloy though it is not obvious from figure 1.…”

“…Such a behavior of the DoS provides the increase of the effect of the presence of the transition metal in the metallic alloy on its transport properties. Indeed, this is known to be associated with the broadening of the impurity d-states due to the interaction with the conduction band of the host metal [23,24]. The theoretical background to these works is based on Friedel concept of virtual bound d-states and Anderson theory of s-d mixing.…”

Optical and electrical properties of polycrystalline and amorphous Al-Ti thin films

“…Aluminum alloys with dilute concentration of Cr, Mn, or Fe were found to be magnetic 20,24,25 but non-magnetic in case of Ti. 26 The optical reflectance depends mainly on the electrical resistivity (q) and the electron scattering time (s). Optical reflectance of the Al-Ti alloys as a function of the square root of the electrical resistivity is plotted in Fig.…”