Novel compounds in the Sc-rich part of the systems Sc-{Co,Pd,Pt}-Ga: Structure and bonding

V.V. Romaka; G. Rogl; J. Bursik; A. Grytsiv; G. Giester; P. Rogl

doi:10.1016/j.jallcom.2024.174864

Titel

Novel compounds in the Sc-rich part of the systems Sc-{Co,Pd,Pt}-Ga: Structure and bonding

Autor*in

V.V. Romaka

Institut für Materialchemie, Fakultät für Chemie, Universität Wien

G. Rogl

Institut für Materialchemie, Fakultät für Chemie, Universität Wien

J. Bursik

Institute of Physics of Materials, Czech Academy of Sciences

... show all

Abstract

The present paper comprises a detailed structural analysis of two novel compounds in the Sc-Co-Ga system: τ3-Sc50Co13Ga3 (space group Fm-3; ε-Mg26-xAg7+x type), and τ4-Sc6Co1.73+x+yGa1-x (space group Immm; x=0.43; y=0.14; Ho6Co2Ga derivative type). Although alloys in the isothermal section are oxygen-free, the alloy of τ3, prepared for single crystal growth via partial melting in an alumina crucible, contained a minor amount of oxygen and can be considered as oxygen-stabilized Sc50Co13Ga3O1.1 (WDX-data). A search for homologous compounds in the systems Sc-{Pd,Pt}-Ga prompted the existence of two compounds Sc54{Pd,Pt,Ga}17, which from X-ray single crystal analyses proved both to be isotypic with the Hf54Os17-type structure (space group Immm). Whereas Sc54(Pd0.652Ga0.348)17 has a very limited homogeneity region at 850°C, Sc54(Pt1-xGax)17 exhibits at 850°C a large homogeneity region (0

Stichwort

Scandium-rich compoundsCrystal structureMechanical propertiesElectronic band structureBader charge distribution

Objekt-Typ

journal article

Sprache

Englisch [eng]

Persistent identifier

phaidra.univie.ac.at/o:2086364

DOI

10.1016/j.jallcom.2024.174864

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