Complex Crystal Chemistry of Yb6(CuGa)50 and Yb6(CuGa)51 Grown at Different Synthetic Conditions
| Autor: | Sebastian C. Peter, Saurav Ch. Sarma, Soumyabrata Roy, Dundappa Mumbaraddi, Vidyanshu Mishra, Udumula Subbarao, Anton O. Oliynyk |
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| Rok vydání: | 2018 |
| Předmět: |
Valence (chemistry)
Materials science 010405 organic chemistry Crystal chemistry chemistry.chemical_element General Chemistry Atmospheric temperature range 010402 general chemistry Condensed Matter Physics 01 natural sciences Magnetic susceptibility 0104 chemical sciences Metal Crystallography chemistry Electrical resistivity and conductivity visual_art visual_art.visual_art_medium General Materials Science Gallium Spectroscopy |
| Zdroj: | Crystal Growth & Design. 18:6091-6099 |
| ISSN: | 1528-7505 1528-7483 |
| Popis: | Two new compounds in the Yb–Cu–Ga system were discovered. Yb6(CuGa)50 was obtained as single crystals grown from gallium metal flux, and Yb6(CuGa)51 was synthesized by high-frequency induction heating technique. Structure analysis reveals new structure type for Yb6(CuGa)50 (C2/m space group), while Yb6(CuGa)51 crystallizes in rhombohedral space group R3m adopting the Th2Zn17 structure type. Both structures could be derived from the simplest layered packing, through CaCu5-type structure, as a common parent. Physical properties of the Yb6(CuGa)51 sample obtained bulk quantity were explored. The magnetic susceptibility study of Yb6(CuGa)51 in the temperature range of 2–300 K suggests a valence fluctuation at lower temperatures. X-ray absorption near edge spectroscopy suggests that Yb exists in mixed-valent state in Yb6(CuGa)51. Electrical resistivity measurement reveals that Yb6(CuGa)51 is metallic in nature and shows Fermi-liquid behavior in the temperature range from 3.5 to 25 K. |
| Databáze: | OpenAIRE |
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