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Crystal structure of the new ternary antimonide Y 3 Ni 6 Sb 5 was investigated using X-ray single crystal data: own type of structure, space group P 2 1 / m , a = 1.06358(6) nm, b = 0.42030(3) nm, c = 1.26520(9), β = 113.326(3)°, Z = 2, R F = 0.055, wR F = 0.063 for 1341 independent reflections and 98 variable parameters. Isotypic compounds Gd 3 Ni 6 Sb 5 and Tb 3 Ni 6 Sb 5 were synthesized. Magnetic and electric transport properties were studied in the temperature range above 5 K. Y 3 Ni 6 Sb 5 is a temperature independent Pauli type paramagnet. The Gd 3 Ni 6 Sb 5 compound orders ferromagnetically at T C = 8 K, whereas the Tb 3 Ni 6 Sb 5 homologue is an antiferromagnet at T N –5 K. The onset of magnetic ordering is also proved by the electrical resistivity measurements. The analysis of the resistivity, ρ ( T ), measurements for Y 3 Ni 6 Sb 5 resulted in a Debye temperature Θ D = 135 K.

A new ternary phosphide Y 6 Ni 15− x P 10+ y ( x =0.08, y =0.18) has been obtained in the Y–Ni–P system. Single crystals of this compound have been investigated on a Nonius KappaCCD X-ray diffractometer using Mo Kα radiation ( λ =0.071073 nm). The symmetry has been found to be hexagonal with space group P 6 3 / m and unit cell parameters a =1.6447(1) nm and c =0.37891(2) nm. Structure refinement including anisotropic displacement parameters led to the following results: R F =0.056 ( R w =0.047), GOF=1.060 for 558 reflections with F ( h k l ) > 4 σF ( h k l ). The ternary phosphide Y 6 Ni 15− x P 10+ y exhibits a new structure, which is derived from the Ce 6 Ni 15 P 10 and Nd 3 Ni 7 P 5 structure types.