The 400℃ Isothermal Section Of The Phase Diagram Of Ag-Dy-Sb Ternary System

The 400℃ isothermal section of the phase diagram of Ag－Dy－Sb ternary system has been investigated by X－ray powder diffracion, DTA,optical microscopy and scanning electron microscopy he phase diagram consists of 12 single－phase regions,23 two－phase regions and 12 three－phase regions． The 12 single－phase regions are α(Ag),β(Sb),χ(Dy),δ(Ag₅₁Dy_l4,ε(Ag₂ZDy),φ(AgDy),γ(Ag₃Sb), η(Ag_1-xSb_x),ι(Dy₅Sb₃),ψ(DySb),λ(Ag₄Dy₅Sb),μ(AgDySb₂)。 The 23 two－phase regions areα＋δ,δ＋φ,ε＋φ,φ＋χ,α+γ,α＋ψ,γ＋η,η＋ β,β＋ψ,ι＋ψ,ι＋χ,γ＋ψ,ψ＋η,μ＋η,μ＋β,μ＋ψ, δ＋ψ,ψ＋ε,ψ＋λ,λ＋ε,λ＋φ,λ＋χ,λ＋ι。 The 12 three-phase regions are: α＋δ+ψ,α＋ψ＋γ,ψ＋ε+δ,ψ＋η＋μ,γ＋η＋ψ, μ＋η＋β＋μ＋ψ,β＋λ＋ψ,φ＋χ＋λ,χ＋ι＋λ,λ＋ι＋ψ,λ＋ε＋φ。 The exlstence of 7 binary compounds (Ag₅₁Dy₁₄,Ag₂Dy, AgDy, Ag₃Sb,Ag_1-xSb_x,Dy₅Sb₃,Dysb,)has been confirmed and two new ternary compound(Ag₄Dy₅Sb and AgDySb₂)has been found in this paper． The crystal structure of AgDySb₂ has been deterind from X- ray power diffraction data using Rietveld method．It crystallizes in the tetragonal,space group P₄／nmm with a＝4．2656(2)А,c=10．455(6)А, and the CuLsSb₂ structure type．The crystal structure of Ag₄Dy₅Sb Will be determined later．...