Short- and medium-range orders in Al-Mn melts

The solidification of Al–Pd–Mn studied by high-energy X-ray diffraction from electrostatically levitated samples

“…Second, a distinct prepeak in S(Q) is found at approximately Q ~ 2 Å −1 , similar to previous liquid diffraction studies of Al 60 Cu 34 Fe 6 [43], Al-Co-Ni alloys [42], and liquid Al-Mn alloys [41], and indicative of the presence of extended order in the liquid [44]. In previous studies of Al-Mn, Al-Ni and Al-Cu liquids [41], detailed analysis of the prepeak in S(Q) suggested that it was associated with medium-range order (4-5 Å) involving the transition metal atoms on icosahedral clusters in the liquid. Interestingly, this prepeak was not observed in previous neutron diffraction measurements of the liquid structure in Al-Pd-Mn alloys.…”

“…First, we see a shoulder on the right side of the second peak in S(Q), at Q ~ 5.7 Å −1 , that has been observed previously in several quasicrystal-forming systems that manifest icosahedral SRO in the liquid phase [23,[37][38][39][40][41][42]. Second, a distinct prepeak in S(Q) is found at approximately Q ~ 2 Å −1 , similar to previous liquid diffraction studies of Al 60 Cu 34 Fe 6 [43], Al-Co-Ni alloys [42], and liquid Al-Mn alloys [41], and indicative of the presence of extended order in the liquid [44]. In previous studies of Al-Mn, Al-Ni and Al-Cu liquids [41], detailed analysis of the prepeak in S(Q) suggested that it was associated with medium-range order (4-5 Å) involving the transition metal atoms on icosahedral clusters in the liquid.…”

Persistent Medium-Range Order and Anomalous Liquid Properties ofAl1−xCuxAlloys

“…More generally, in the Al-TM liquid alloys (TM = Mn, Fe, Co, Ni, and Cu), the formation of medium-range order (MRO), which is characterized by a pre-peak in the structure factor, has been reported based on high-temperature X-ray and neutron diffraction measurements [7][8][9][10][11]. The short-to-medium range order in the Al-TM liquid alloys is remarkable, considering that a large number of Al-based binary or ternary alloys, e.g., Al-Mn [12] and Al-Cu-TM [13], form quasicrystalline (QC) solid phases via a unique packing of atomic clusters [13,14].…”

“…Also, we found that the Al 75 Cu 25 liquid alloy exhibits a pre-peak in the simulated partial structure factor [Fig. S3], which is a hallmark of the MRO formation in liquids[7][8][9][10][11]. To identify the constituent SRO structure of the MRO in the simulated liquids, we performed a common neighbor analysis[4,30].…”

Spin treatment-based approach for electronic transport in paramagnetic liquid transition metals

“…This potential is constructed from the experimental pair correlation function g(r) which weights the probability of finding an atom at a given position. For liquid chromium, iron, cobalt and nickel, the pair correlation functions are given by Waseda [34], while for liquid manganese it is given by Roik et al [35]. The phaseshifts in the expression of the electronic properties are calculated from a muffin-tin potential using the local density approximation (LDA) and generalized gradient approximation (GGA).…”