On phase equilibria and crystal structures in the systems Ce–Pd–B and Yb–Pd–B. Physical properties of R2Pd13.6B5 (R=Yb, Lu)
| Autor: | Gerald Giester, Peter Rogl, Ernst Bauer, Leonid Salamakha, Oksana Sologub, Gerfried Hilscher, Herwig Michor |
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| Rok vydání: | 2010 |
| Předmět: |
Materials science
Crystal structure Condensed Matter Physics Electronic Optical and Magnetic Materials Inorganic Chemistry chemistry.chemical_compound Paramagnetism Magnetization Crystallography chemistry Ternary compound Materials Chemistry Ceramics and Composites Physical and Theoretical Chemistry Ternary operation Single crystal Powder diffraction Phase diagram |
| Zdroj: | Journal of Solid State Chemistry. 183:1013-1037 |
| ISSN: | 0022-4596 |
| Popis: | Phase equilibria and crystal structures of ternary compounds were determined in the systems Ce–Pd–B and Yb–Pd–B at 850 °C in the concentration ranges up to 45 and 33 at% of Ce and Yb, respectively, employing X-ray single crystal and powder diffraction. Phase relations in the Ce–Pd–B system at 850 °C are governed by formation of extended homogeneity fields, τ2-CePd8B2−x (0.10 The Yb–Pd–B system is characterized by one ternary compound, τ1-Yb2Pd14B5, forming equilibria with extended solution YbPd3Bx, YbB6, Pd5B2 and Pd3B. The crystal structures of both Yb2Pd14B5 and isotypic Lu2Pd14B5 were determined from X-ray Rietveld refinements and found to be closely related to the Y2Pd14B5-type (I41/amd). The crystal structure of binary Yb5Pd2−x (Mn5C2-type) was confirmed from X-ray single crystal data and a slight defect on the Pd site (x=0.06) was established. The three structures τ1-Ce6Pd47−xB6, τ2-CePd8B2−x and τ3-Ce3Pd25−xB8−y are related and can be considered as the packings of fragments observed in Nd2Fe14B structure with different stacking of common structural blocks. Physical properties for Yb2Pd13.6B5 (temperature dependent specific heat, electrical resistivity and magnetization) yielded a predominantly Yb-4f13 electronic configuration, presumably related with a magnetic instability below 2 K. Kondo interaction and crystalline electric field effects control the paramagnetic temperature domain. |
| Databáze: | OpenAIRE |
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