Veremchuk I. Phase equilibria and crystal structure of compounds in the systems Er-Ni-B, Yb-{Fe, Co, Ni}-B and some related.

Isothermal sections of the phase diagrams have been investigated at 800°С for the Er-Ni-B, Yb-{Fe, Co, Ni}-B systems and at 1100°С for the Yb-{Rh, Pd}-B systems. With the purpose of synthesis of isotypical compounds some samples from other Ln-{Ni, Rh, Pd}-B ternary systems have been investigated. Crystal structures of 27 borides have been determineted by X-Ray single crystal or powder methods. 4 new compounds posses their own types of structure: ErNi7.9B2 (SG C2/c, a=1,6626(2) nm, b=0,9525(1) nm, c=1,0686(1) nm, ?=117,76(1)°), Er0.917Ni4.09B (SG P6/mmm, a=1,48399(3) nm, c=0,69194(3) nm), ErNi7B3 (SG I41/amd, a=0,76577(2) nm, c=1,55798(5) nm) and Eu4Pd29B8 (SG I41/amd, a=0,85686(4) nm, c=1,6596(1) nm). New type of solid solution for borides has been revealed: ErB4 dissolves Ni (SG P4/mbm, a=0,70984(8) nm, c=0,38938(6) nm). Comparative analysis of phase equilibria and crystal structure of compounds in the investigated systems and some related ones have been made.