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Talks and Poster Presentations (without Proceedings-Entry):

H. Michor, M. Hembara, A. Schumer, V. Levytskyy, V. Babizhetskyy, B.Ya. Kotur:
"Quasi-binary System CeCoC2-CeNiC2: Crystal Structure and Physical Properties";
Poster: SCTE2018, The 21st International Conference on Solid Compounds of Transition Elements, Wien; 2018-03-25 - 2018-03-29.



English abstract:
Ternary compounds CeTC2 (T = Co, Ni) crystallize in two original structure types: orthorhombic CeNiC2-type, space group Amm2 and monoclinic CeCoC2-type, space group Cc*. These carbides are interesting for their complex magnetic and electric properties**,+. In the present study, we report on crystallographic characteristics,
magnetic properties, heat capacity and electrical resistivity of a series of solid solutions CeCo1-xNixC2 (x = 0, 0.33, 0.5, 0.67, 0.83, 1). The samples were prepared by arc-melting stoichiometric amounts of the constituent elements and annealed at 1073 K for 4 weeks. Co richer solid solutions CeCo1-xNixC2 (0≤ x ≤0.5) crystallize in the monoclinic CeCoC2-type structure; a = 5.4037(3) Å, b = 7.4873(5) Å, c = 5.4075(4) Å, γ = 102.131(6)°, V = 213.90(5) Å3 for x = 0.5. Ni rich CeNi1-yCoyC2 with y = 0.17 and 0 are isotypic with the orthorhombic CeNiC2-type structure, a = 3.8563(7) Å, b = 4.5534(8) Å, c = 6.160(1) Å, V = 108.17(6) Å3 for y = 0.17. In the region 0.5< x <0.83 two phases CeCo1-xNixC2 and CeNi1-yCoyC2 coexist. The non-isoelectronic substitution of Ni by Co in the solid solution CeNi1-yCoyC2 causes a continuous reduction of Néel temperature and finally results in a paramagnetic Kondo-lattice ground state of CeCoC2.
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* W. Jeitschko and M. Gerss. J. Less Common Met. 116, 147 (1986).
** H. Onodera, Y. Koshikawa, M. Kosaka, M. Ohashi, H. Yamauchi, and Y. Yamaguchi. J. Magn. Magn. Matter. 182, 161 (1998).
+ W. Schäfer, W. Kockelmann, G. Will, J. Yakinthos, P. Kotsanidis. J. Less Common Met. 250, 565 (1997).

Created from the Publication Database of the Vienna University of Technology.