Kristallstruktur von NiMg₂, CuMg₂ und AuMg₃

NdNiMg5, a New Magnesium-Rich Phase with an Unusual Structural Type

“…The Ni atoms are surrounded by six Mg atoms (Figure ) with Ni–Mg distances equal to 2.668–2.804 Å, which are slightly shorter than the sum of the covalent (i.e., 2.75 Å) and metallic (2.85 Å) radii, respectively. The shortest Nd–Ni distance is comparable to the average distance of 2.68 Å observed in Mg 2 Ni . Considering a Nd–Mg distance of up to 3.4 Å, i.e., the sum of the metallic radii, there are 10 Mg atoms in the coordination sphere of Nd (Figure ).…”

Double Helix of Icosahedra Structure and Spin Glass Magnetism of the δ-Co2.5Zn17.5–xMnx (x = 0.4–3.5) Pseudo-Binary Alloys

“…Out of the overall 230 space groups, the subgroup of 65 space groups (denoted as Sohncke groups) describes chiral crystal structures. Known examples of chiral intermetallic crystals are the Mg 2 Ni-type structures that crystallize in the space group P 6 2 2 2 , Ir 3 Zr 5 in P 6 1 2 2 , RuZn 6 in P 4 1 3 2 , δ-Co 2.5 Zn 17.5 (equivalent to δ-Co 2 Zn 15 ) in P 6 2 , and ternary compounds Co x Zn y Mn z ( x + y + z = 20, with a representative Co 8 Zn 9 Mn 3 ) that crystallize in the cubic β-Mn type structure with two chiral enantiomers P 4 1 3 2 and P 4 3 3 2 . Structural chirality is considered to play an important role in the electronic and magnetic properties of these systems, as it affects the band structure and thus the electronic density of states, and is involved in the formation of spirally ordered magnetic states such as helimagnetic, conical, skyrmion, and chiral spin soliton lattices. − Examples are the Co x Zn y Mn z ( x + y + z = 20) compounds that were reported to exhibit magnetic skyrmion spin textures. ,, …”

The Influence of the Continuous Casting Conditions on the Properties of High-Strength Two-Phase CuMg Alloys

“…There is only one research paper concerning copper magnesium alloys and their corrosion resistance and unfortunately it presents research results on single-phase CuMg alloys [13]. The phase diagram of CuMg alloy [14] depicts distinctly visible intermetallic Cu 2 Mg and CuMg 2 phases (Laves phases) which were examined in [15,16] by Schubert et al and Lieser et al Additionally, Miroshnichenko et al [17] proved the existence of metastable intermetallic Cu 3 Mg phase. Phase diagram also shows that two-phase CuMg alloys exist above 3% of wt.% of Mg and are formed with α phase (Cu) and intermetallic β phase (Cu 2 Mg), hardness of which has been tested and is proven to be H = 519 [18] and according to Mao et al it is ductile [19].…”