[Zurück]

H. Michor, A. Schumer, M. Hembara, B. Kotur, V. Levytskyy, V. Babizhetskyy:
"The Quasi-Binary System CeCoC₂-CeNiC₂: Crystal Structure and Physical Properties";
Solid State Phenomena, 289 (2019), S. 114 - 119.

The crystal structure of phases in the pseudo-binary system CeCo_1-хNi_хC₂ (x = 0, 0.33, 0.5, 0.67, 0.79, 0.80, 0.83, 1) was investigated by means of X-ray powder diffraction. Co richer solid solutions CeCo_1-хNi_хC₂ (0≤x≤0.5) crystallize in the monoclinic CeCoC₂-type structure; a = 5.3968(2) Å, b = 5.4013(3) Å, c = 7.4762(3) Å, β = 102.136(3)°, V = 213.06(3) Å3 for x = 0.5. Ni-rich CeNi_1-yCo_yC₂ (0≤y≤0.2) are isotypic with the orthorhombic CeNiC₂-type structure, a = 3.8486(2) Å, b = 4.5479(2) Å, c = 6.1531(3) Å, V = 107.70(1) Å3 for y = 0.2. In the intermediate region (0.5<x<0.79) both phases, CeCo_0.21Ni_0.79C₂ and CeCo_0.5Ni_0.5C₂, coexist. The non-isoelectronic substitution of Ni by Co in solid solutions CeNi_1-yCo_yC₂ causes a continuous reduction of the Néel temperature and finally, for CeCoC₂, results in a paramagnetic Kondo-lattice ground state.

carbides; CeNiC2-type structure; CeCoC2-type structure; magnetic properties

http://dx.doi.org/10.4028/www.scientific.net/SSP.289.114