On the structural and magnetic properties of the ternary silicides Ce{sub 6} M {sub 1.67}Si{sub 3} (M=Co, Ni) and Ce{sub 5}Ni{sub 1.85}Si{sub 3}
- Institut de Chimie de la Matiere Condensee de Bordeaux (ICMCB), CNRS (UPR 9048), Universite Bordeaux 1, 87 Avenue du Docteur A. Schweitzer, 33608 Pessac Cedex (France)
Contrary to that reported previously, the ternary silicide 'Ce{sub 6}Ni{sub 2}Si{sub 3}' does not exist. The melting of this alloy, followed or not by annealing, leads to the existence of the two new ternary compounds, Ce{sub 6}Ni{sub 1.67}Si{sub 3} and Ce{sub 5}Ni{sub 1.85}Si{sub 3}. The investigation of these ternary silicides based on nickel and Ce{sub 6}Co{sub 1.67}Si{sub 3} by X-ray diffraction on single crystal reveals an ordered distribution between Ni (or Co) and Si atoms. The nickel or cobalt positions in the chains of face-shared octahedra of cerium are not fully occupied with a strong delocalisation of their electron density. The structural investigations of these compounds confirm that the 'Ce{sub 6}Ni{sub 2}Si{sub 3}' and 'Ce{sub 5}Ni{sub 2}Si{sub 3}' structural type have to be rewritten as Ce{sub 6}Ni{sub 2-} {sub x} Si{sub 3} and Ce{sub 5}Ni{sub 2-} {sub x} Si{sub 3}. Magnetisation and specific heat measurements evidence a magnetic ordering at 3.8(2) K for Ce{sub 6}Ni{sub 1.67}Si{sub 3} and a heavy fermion behaviour for Ce{sub 6}Co{sub 1.67}Si{sub 3}. - Graphical abstract: Projection along the c-axis of the structure of Ce{sub 6}Co{sub 1.67}Si{sub 3}. A strong delocalisation of cobalt atoms is observed in the chains of cerium octahedra.
- OSTI ID:
- 21015789
- Journal Information:
- Journal of Solid State Chemistry, Vol. 180, Issue 4; Other Information: DOI: 10.1016/j.jssc.2007.01.030; PII: S0022-4596(07)00063-1; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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