The phase relations in the Gd-Fe-Ga ternary system at 500 ℃
The isothermal section(500 oC)of the phase diagram of the Gd-Fe-Ga ternary system WaS investigated by X-ray powder diffraction analysis．Eleven binary compounds，GdGa2，GdGa，Gd3Ga2，Gd5Ga3，GdFe2，GdFe3，Gd2Fe17，Fe3Ga,Fe6Ga5，Fe3Ga4 and FeGa3，have been confirmed．Two ternary compounds，GdFe6Ga6 and GdFe5.2Ga6.8.were found in this ternary system at 500 oC．The compound GdFe6Ga6 is orthorhombic ScFe6Ga6-type structure(space group Immm)with a=0.8567，b=0.8696 and C=0.5078 am，while the compound GdFe5.2Ga6.8 is tetragonal ThMn12-type structure(space group 14/mmm)with a=0.8676 and C=0.5093 nm．The isothermal section at 500 oC consists of 16 single-phase regions,31 two-phase regions and 16 three-phase regions．The maximum solid solubility of Ga in GdFe2，GdFe3，Gd2Fe17 are 5，3，and 40 at．％respectively．The homogeneity range ofGdGa2 is from 22 t0 3313 at．％Ga in Gd-Ga side but the solid solubility of Fe in this compound is very small．Very limited solid solutions were measured in the other compounds．
稀土化合物 金相图 三元相图 X射线衍射
D.C.Liu J.Q.Li M.Ouyang F.S.Liu W.Q.Ao
School of Materials Science and Engineering Shenzhen University and Shenzhen Key Laboratory of Speci School of Materials Science and Engineering Shenzhen University and henzhen Key Laboratory of Specia
国内会议
长沙
英文
85-90
2008-11-01（万方平台首次上网日期，不代表论文的发表时间）