Stoyko S. Phase equilibria and crystal structure of compounds in Y-{Co, Ni}-{P, As, Sb} systems and related with them.

The isothermal cross-sections of the phase diagrams of the systems Y-Ni-P at 1070 К, Y-{Co, Ni}-As at 970 К, Y-Co-Sb at 870 К and Y-Ni-Sb at 770 К over concentration range of 0-0,67 mol. p. P, As or Sb were constructed based on X-ray phase, X-ray structural and local X-ray spectral analyses. Eighteen ternary pnictides have been synthesized for the first time. The crystal structures of seven binary and ternary compounds, which belong to new type structures: Ni5P2 (SG Р-3с1, PS hP62, a = 0,6613(3), c = 1,2311(6) nm), Ni5As2 (SG Р63cm, PS hP48, a = 0,68253(1), c = 1,25197(4) nm), Y6Ni14,92P10,18 (SG P63/m, PS hP70, a = 1,6447(1), c = 0,37891(2) nm), Y20Ni42P30,34 (SG P63/m, PS hP100, a = 2,0270(1), c = 0,38030(2) nm), Y8Co42As25 (SG P63/m, PS hP76, a = 1,7726(3), c = 0,37945(6) nm), Y6Ni20,04As12,78 (SG P63/m, PS hP54, a = 1,31349(4), c = 0,38707(1) nm), Y3Ni5,8Sb5 (SG P21/m, PS mP34, a = 1,06358(6), b = 0,42030(2), c = 1,26520(9) nm, beta = 113,326(3), were determined from single crystal X-ray diffraction data. The comparative analysis of the components interaction and the crystal structures of compounds in Ln-{Co, Ni}-{P, As, Sb} systems, where Ln - rare earth metals of yttrium subgroup, was performed. Magnetic suscebility and electric resistance measurements have been performed for several compounds of the Y3Ni5.8Sb5 type structure.