Abstract
Single phases of Nd 6Ni 1.67Si 3 and Nd 6Co 1.67Si 3 were prepared by arc melting of a stoichiometric mixture of the elements followed by annealing at 1073 K. The structure of Nd 6Co 1.67Si 3 was determined from single-crystal X-ray data with the space group P6 3/ m and the lattice parameters a = 11.950(4) Å and c = 4.232(2) Å. Its structure derives from the structure of the aristotype compound Ce 6Ni 1.67Si 3. A strong disorder of cobalt atoms in the chains of face-shared octahedra of neodymium is observed. Magnetization measurements reveal the existence of two ferro(ferri)magnetic transitions at 84(1) K and 38(1) K for Nd 6Ni 1.67Si 3. For Nd 6Co 1.67Si 3 it has been previously shown that also two ferro(ferri)magnetic transitions occur at 84 K and 35 K. The comparison between the magnetic properties of Nd 6Ni 1.67Si 3 and Nd 6Co 1.67Si 3 shows a significant difference of the behaviour of the magnetization M versus temperature and field μ 0 H below 84 K. The curves M = f( T) obtained by field-cooled (FC) process and under μ 0 H = 0.1 T show an increase of M below 35 K for Nd 6Co 1.67Si 3 and on the contrary, a decrease of M below 38 K for Nd 6Ni 1.67Si 3. This difference suggests the occurrence at low temperature of different magnetic structures for these two ternary silicides.
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