Synthesis, structure and physical properties of U3Co2Si7 and Np3Co2Si7 compounds

A new ternary compound Np3Co2Si7 was found to crystallize in the orthorhombic La3Co2Sn7-type structure, space group Cmmm (N°65) with room temperature lattice parameters determined from powder diffraction as follows: a 4.000 (1) Å, b 24.491 (8) Å, c 4.020 (2) Å, (V 393.8 Å3). Np3Co2Si7 orders ferroma...

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Bibliographic Details
Published in:Journal of physics. Conference series 2010-01, Vol.200 (3), p.032017
Main Authors: Eloirdi, R, Colineau, E, Griveau, J-C, Gofryk, K, Surblé, S, Gaczynski, P, Caciuffo, R
Format: Article
Language:English
Subjects:
Curie temperature
Ferromagnetism
Lattice parameters
Physical properties
Physics
Room temperature
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Summary:A new ternary compound Np3Co2Si7 was found to crystallize in the orthorhombic La3Co2Sn7-type structure, space group Cmmm (N°65) with room temperature lattice parameters determined from powder diffraction as follows: a 4.000 (1) Å, b 24.491 (8) Å, c 4.020 (2) Å, (V 393.8 Å3). Np3Co2Si7 orders ferromagnetically with a Curie temperature of about 32 K. U3Co2Si7 has also been prepared for comparison. It is isostructural to Np3Co2Si7with lattice parameters a 4.010 (6) Å, b 24.389 (2) Å, c 4.022 (5) Å. An annealing of U3Co2Si7 at 1223 K for 10 days is required to obtain it as a single phase. U3Co2Si7 was reported in the literature as a ferromagnet. However, our measurements show a paramagnetic behavior and the presence of a weak ferromagnetic impurity.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/200/3/032017