THE 520-DEGREES-C ISOTHERMAL SECTION OF THE PHASE-DIAGRAM OF THE TERNARY DY-FE-SI SYSTEM

The 530 degrees C isothermal section of the Dy-Fe-Si system was invest igated by X-ray powder diffraction, differential thermal microanalysis and electron-probe microanalysis techniques. At 520 degrees C, it con sists of 21 single-phase regions, 46 two-phase regions and 26 three-ph ase regions. The existence of eleven binary compounds and seven ternar y compounds was conformed. Among seven ternary compounds. DyFe3Si6 and DyFe11Si are new phases, which belong to the hexagonal system with a= 0.3931 nm, c=1.5431 nm and tetragonal system with a=0.8519 nm, c=0.178 0 nm, respectively. (C) 1998 Elsevier Science S.A.