Exploratory Synthesis with Molten Aluminum as a Solvent and Routes to Multinary Aluminum Silicides. Sm₂Ni(Ni_xSi_1-x)Al₄Si₆(x= 0.18−0.27):  A New Silicide with a Ferromagnetic Transition at 17.5 K

Abstract

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Quaternary Germanides Formed in Molten Aluminum: Tb2NiAl4Ge2 and Ce2NiAl6-xGe4-y (x ∼ 0.24, y ∼ 1.34)Dedicated to Professor Welf Bronger on the Occasion of his 70th Birthday

“…Tb 2 NiAl 4 Ge 2 zeigt Curie-Weiss paramagnetisches Verhalten mit einem antiferromagnetischen Übergang bei ഠ20 K. Ce 2 NiAl 6Ϫx Ge 4Ϫx zeigt ein sehr viel komplexeres magnetisches Verhalten, wahrscheinlich aufgrund von temperaturinduzierten Änderung der Valenz des Ce-Atoms. containing compounds including Sm 2 Ni(Si 1-x ,Ni x )Al 4 Si 6 [2], RENiAl 4 Ge 2 (RE ϭ Sm, Tb, Y) [3], RE 2 Fe(Fe,Si)Al 3 Si 4 (RE ϭ Ce, Pr, Nd, Sm) [4], REFe 4 Al 9 Si 6 (RE ϭ Tb, Er) [5], RE 8 Ru 12 Al 49 Si 9 (Al x Si 12-x ) (RE ϭ Sm and Pr) [6] and RE 2 Al 3 Si 2 (RE ϭ Ho, Er, Tm) [1a]. In addition to being of basic scientific interest complex intermetallics of Al are of interest to applied metallurgy due to their compositional relationships to aluminum matrix composites [7].…”

A Tale of Two Polymorphs – Growth and Characterization of α‐LnNiGa4 (Ln = Y, Gd–Yb) and β‐LnNi1–xGa4 (Ln = Tb–Er)

“…2.49 Å) [26] and with the Ni-Ga binaries, which range from approximately 2.47 to 2.61 Å. [27][28][29][30][31] The NiGa 6 bicapped cubes (Figure 3c) are very similar to the bicapped MGa 6 (M = Ga or transition metal) cubes found in Ce 2 NiGa 10 , [14] Ln 3 NiGa 10 (Ln = Ce-Nd), [32] [34] YNiGa 3 Ge, [19] Ce 2 NiAl 6-x Ge 4-y , [22] YbGa 5 , [35] and Ce 2 Ag 1-x Ga 10-y . [6] The puckered Ni x Ga 2 square nets, which are approximately 43 % occupied by Ni for Ln = Tb-Ho and approximately 32 % occupied by Ni for Ln = Er, have Ni2-Ga interatomic distances that range from approximately 1.63 to 2.68 Å (Figure 3d).…”

Ln2Al3Si2 (Ln=Ho, Er, Tm): New Silicides from Molten Aluminum—Determination of the Al/Si Distribution with Neutron Crystallography and Metamagnetic Transitions

“…The study of molecular thin films for use in the controlled design of interfacial properties [1] that have important implications in many different fields ranging from research on friction, lubrication and wetting, [2] development of micro-and nanoscale devices [3] to biocompatible surfaces, has attracted considerable interest. [4] Most of the work has concentrated on self-assembled monolayers (SAMs), in particular on the selfassembly of sulfur-bearing molecules such as thioalkanes [5] and lipids [6] on the surface of gold, or suitable silanes to hydroxylated surfaces (usually silicon oxide or glass). [7] Selfassembled molecular thin films that comprise biopolymers are most interesting for the development of novel analytical techniques.…”

“…Recently, we have initiated exploratory synthetic investigations of silicides using metal fluxes and find that many new aluminum silicides form, most with novel structure types. [6] These compounds usually decompose rapidly upon contact with acid, but they can be easily separated from the excess Al flux with aqueous sodium hydroxide solution. The products often consist of many single crystals with nice shapes.…”