Demchyna M. Phase equilibria, crystal structures and selected physical properties of the compounds in {Tb, Dy}-{Mn, Fe, Ag}-In and related systems

The isothermal sections of {Tb, Dy}-{Mn, Fe, Ag}-In phase diagrams were constructed based on X-ray phase and particularly EDX-analyses over the whole concentration range at 870 K. The samples were synthesized in an arc-furnace under an argon atmosphere and annealed in an evacuated quartz tube at 870 K for 720 h. The crystal structures were determined from single crystal and powder X-ray diffraction data. The crystal structures were solved with help of programs DBWS-9807, FullProf 2000 and SHELXS-97, SHELXL-97, WinCSD. The existence of seven solid solutions based on TbMn2, DyMn2, TbFe2, TbAg, TbIn3, DyAg, DyIn3 binary compounds was found in {Tb, Dy}-{Mn, Fe, Ag}-In ternary systems. Crystal structures of eleven samples were determined using X-ray single crystal diffraction analysis and of twenty three samples - using X-ray powder diffraction analysis. Basic magnetic properties of some phases from R-Mn-In (R = Tb, Dy) systems were measured. Magnetic measurements were performed in the temperature range 2-400 K in magnetic fields up to 5 T by means of SQUID (Quantum Design) magnetometer. The relationship between Sm12Ni6In, Ho6Co2Ga and Er12Fe2In3 structures was determined. These structures form homological series, general formula of which is R3(x+y)M2xXy, (R - rare earth, M - transition metal, X - p-metal, and x - quantity of fragment with R3M2 composition, y - quantity of fragment with R3X composition)