1. Novel compounds in the Sc-rich part of the systems Sc-{Co,Pd,Pt}-Ga: Structure and bonding.
- Author
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Romaka, V.V., Rogl, G., Bursik, J., Grytsiv, A., Giester, G., and Rogl, P.
- Subjects
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SOLUTION strengthening , *CRYSTAL growth , *SINGLE crystals , *YOUNG'S modulus , *SPACE groups , *GALLIUM alloys , *SEMIMETALS - Abstract
The present paper comprises a detailed structural analysis of two novel compounds in the Sc-Co-Ga system: τ 3 -Sc 50 Co 13 Ga 3 (space group Fm -3; ε-Mg 26-x Ag 7+x type), and τ 4 -Sc 6 Co 1.73+x+y Ga 1-x (space group Immm; x=0.43; y=0.14; Ho 6 Co 2 Ga derivative type). Although alloys in the isothermal section are oxygen-free, the alloy of τ 3, 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 Sc 50 Co 13 Ga 3 O 1.1 (WDX-data). A search for homologous compounds in the systems Sc-{Pd,Pt}-Ga prompted the existence of two compounds Sc 54 {Pd,Pt,Ga} 17 , which from X-ray single crystal analyses proved both to be isotypic with the Hf 54 Os 17 -type structure (space group Immm). Whereas Sc 54 (Pd 0.652 Ga 0.348) 17 has a very limited homogeneity region at 850°C, Sc 54 (Pt 1-x Ga x) 17 exhibits at 850°C a large homogeneity region (0
- Published
- 2024
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