The Isothermal Section Phase Diagrams Of La-Fe-Ge And La-Fe-Sn Ternary System At 773K

Phase relations in the La-Fe-Ge ternary system at 773K and La-Fe-Sn ternary system at 773K have been investigated in this work.The main contents of them were related as followed:1.The isothermal section of La-Fe-Ge ternary system at 773KThe isothermal section of the phase diagram of the La-Fe-Ge ternary system at 773K was investigated by X-ray powder diffraction(XRD)and differential thermal analysis(DTA).The existences of 12 binary compounds, La₃Ge,La₅Ge₃,La₄Ge₃,La₅Ge₄,LaGe,La₂Ge₃,LaGe_2-x,Fe₃Ge,Fe₅Ge₃, Fe₆Ge₅,FeGe,FeGe₂,were confirmed.Three ternary compounds LaFe₂Ge₂, LaFe_0.6Ge₂ and LaFeGe₃ were confirmed too.Ge in Fe,LaGe,LaGe_2-xand Fe₅Ge₃ and Fe in LaFe_0.6Ge₂ have solid solution phenomenon.This section consists of 18 single-phase regions,36 two-phase regions,and 19 three-phase regions.2.The isothermal section of La-Fe-Sn ternary system at 773KPhase relations in the La-Fe-Sn ternary system at 773K have been investigated by means of powder X-ray diffraction technique.This section consists of 13 single-phase regions,23 two-phase regions,and 13 three-phase regions.Two ternary compounds,which have been reported, La₆Fe₁₃Sn and La₃FeSn₆ have also been confirmed to exist in our work.we found the Fe has a solid soluble region in LaFe_xSn₂.The solid solubility which was determined by the method of vanishment of phase is about x=0.3-0.4.