K3Au5Pb: eine Schichtstruktur mit∞2[AuAu3/2]-Gold-Tetraedern und∞1[Pb2/2]-Blei-Ketten

Schwarz‐glänzende, spröde Einkristalle von M3AuGe4 mit M = K, Rb, Cs wurden durch Umsetzung von Alkalimetallaziden MN3 mit Goldschwamm und Germaniumpulver bei T = 1120 K synthetisiert. Die Strukturen der Verbindungen (Raumgruppe Pmmn, Z = 2, K3AuGe4: a = 6, 655(1)Å, b = 11, 911(2)Å, c = 6, 081(1)Å; Rb3AuGe4: a = 6, 894(1)Å, b = 12, 421(1)Å, c = 6, 107(1)Å; Cs3AuGe4: a = 7, 179(1)Å, b = 12, 993(2)Å, c = 6, 112(2)Å) wurden aus Röntgen‐Einkristall‐Diffraktometerdaten bestimmt. Die elektrisch halbleitenden Verbindungen enthalten [AuGe4]‐Ketten, in denen P4‐analoge Ge4‐Tetraeder über μ2‐verbrückende Goldatome mit verzerrt tetraedrischer Koordination am Germaniumatom verknüpft werden.

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Laves phases: a review of their functional and structural applications and an improved fundamental understanding of stability and properties

Stein

Leineweber

2020

J Mater Sci

285

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Laves phases with their comparably simple crystal structure are very common intermetallic phases and can be formed from element combinations all over the periodic table resulting in a huge number of known examples. Even though this type of phases is known for almost 100 years, and although a lot of information on stability, structure, and properties has accumulated especially during the last about 20 years, systematic evaluation and rationalization of this information in particular as a function of the involved elements is often lacking. It is one of the two main goals of this review to summarize the knowledge for some selected respective topics with a certain focus on non-stoichiometric, i.e., non-ideal Laves phases. The second, central goal of the review is to give a systematic overview about the role of Laves phases in all kinds of materials for functional and structural applications. There is a surprisingly broad range of successful utilization of Laves phases in functional applications comprising Laves phases as hydrogen storage material (Hydraloy), as magneto-mechanical sensors and actuators (Terfenol), or for wear- and corrosion-resistant coatings in corrosive atmospheres and at high temperatures (Tribaloy), to name but a few. Regarding structural applications, there is a renewed interest in using Laves phases for creep-strengthening of high-temperature steels and new respective alloy design concepts were developed and successfully tested. Apart from steels, Laves phases also occur in various other kinds of structural materials sometimes effectively improving properties, but often also acting in a detrimental way.

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K3Au5Pb: eine Schichtstruktur mit∞2[AuAu3/2]-Gold-Tetraedern und∞1[Pb2/2]-Blei-Ketten

Cited by 8 publications

References 6 publications

ChemInform Abstract: K₃Au₅Pb: Layers of ²_∞[AuAu_3/2] Gold Tetrahedra and ¹_∞[Pb_2/2] Lead Chains.

ChemInform Abstract: K₃Au₅Pb: Layers of ²_∞[AuAu_3/2] Gold Tetrahedra and ¹_∞[Pb_2/2] Lead Chains.

Zintl‐Verbindungen mit Gold und Germanium: M₃AuGe₄ mit M = K, Rb und Cs

Laves phases: a review of their functional and structural applications and an improved fundamental understanding of stability and properties

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K3Au5Pb: eine Schichtstruktur mit∞2[AuAu3/2]-Gold-Tetraedern und∞1[Pb2/2]-Blei-Ketten

Cited by 8 publications

References 6 publications

ChemInform Abstract: K3Au5Pb: Layers of 2∞[AuAu3/2] Gold Tetrahedra and 1∞[Pb2/2] Lead Chains.

ChemInform Abstract: K3Au5Pb: Layers of 2∞[AuAu3/2] Gold Tetrahedra and 1∞[Pb2/2] Lead Chains.

Zintl‐Verbindungen mit Gold und Germanium: M3AuGe4 mit M = K, Rb und Cs

Laves phases: a review of their functional and structural applications and an improved fundamental understanding of stability and properties

Contact Info

Product

Resources

About

ChemInform Abstract: K₃Au₅Pb: Layers of ²_∞[AuAu_3/2] Gold Tetrahedra and ¹_∞[Pb_2/2] Lead Chains.

ChemInform Abstract: K₃Au₅Pb: Layers of ²_∞[AuAu_3/2] Gold Tetrahedra and ¹_∞[Pb_2/2] Lead Chains.

Zintl‐Verbindungen mit Gold und Germanium: M₃AuGe₄ mit M = K, Rb und Cs