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  5. The phase relations in the Gd-Fe-Ga ternary system at 500 ℃

The phase relations in the Gd-Fe-Ga ternary system at 500 ℃

来源 :第十四届全国相图会议暨国际相图与材料设计研讨会 | 被引量 : 0次 | 上传用户：losches
【摘 要】
：
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，Gd2
【作 者】
：
D.C.Liu J.Q.Li M.Ouyang F.S.Liu W.Q.Ao 
【机 构】
：
School of Materials Science and Engineering Shenzhen University and Shenzhen Key Laboratory of Speci
【出 处】
：
第十四届全国相图会议暨国际相图与材料设计研讨会
【发表日期】
：
2008年4期
【关键词】
：
稀土化合物 金相图 三元相图 X射线衍射 
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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．
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