Crystal Structure and Magnetic Properties of the Ternary Germanide U3Co4Ge7: An Intergrowth of CaBe2Ge2- and Cu3Au-Type Slabs
| Autor: | B. Darriet, W. Jeitschko, Rainer Pöttgen, Jean Etourneau, Pierre Gravereau, Bernard Chevalier |
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| Rok vydání: | 1995 |
| Předmět: |
Chemistry
Rietveld refinement Magnetism Crystal structure Condensed Matter Physics Magnetic susceptibility Electronic Optical and Magnetic Materials Inorganic Chemistry Germanide Crystallography Tetragonal crystal system chemistry.chemical_compound X-ray crystallography Materials Chemistry Ceramics and Composites Physical and Theoretical Chemistry Ternary operation |
| Zdroj: | Journal of Solid State Chemistry. 115:247-254 |
| ISSN: | 0022-4596 |
| Popis: | An electon and X-ray diffraction investigation of powder and single crystals shows that U 3 Co 4 Ge 7 crystallizes in a tetragonal structure with the space group I 4/ mmm ,: a = 410.87(7) pm, c = 2747.7(9) pm, V = 0.4638(2) nm 3 , Z = 2, R = 0.039 for the Rietveld refinement, and R = 0.050 for the single-crystal study (373 F values and 21 variables). Its structure shows some similarities with that of Eu 2 Pt 7 AlP 4- x and can be interpreted as an intergrowth of CaBe 2 Ge 2 - and Cu 3 Au-type blocks. U 3 Co 4 Ge 7 orders ferro- or ferrimagnetically at 21.5(5) K and exhibits another magnetic transition below 20.5(3) K. Its properties are compared to those observed for other ternary germanides such as UCo 2 Ge 2 and UCoGe. |
| Databáze: | OpenAIRE |
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