本文用X射线衍射方法研究了Gd-Fe-Ti三元系室温截面图.Gd-Fe-Ti三元系有二个三元化合物,即GdFe_(11)Ti和GdFe_9Ti_2。GdFe_(11)Ti的空间群为 I4/mmm,Z=2,属 ThMn_(12)型结构,其点阵常数 a=0.8522nm,c=0.4790nm,c/a=0.562;其计算密度为7.82g/cm~3,实测密度为7.84g/cm~3.Curie温度为349℃.GdFe_9Ti_2的空间群为P4/mbm,Z=2,属Ce(Mn_(0.55)Ni_(0.45))_(11)型结构,其点阵常数a=0.8245nm,c=0.4832nm,c/a=0.586;其计算密度为7.64g/cm~3,实测密度为7.6g/cm~3. In this paper, X-ray diffraction method was used to study the Gd-Fe-Ti ternary system at room temperature.Gd-Fe-Ti ternary system has two ternary compounds, GdFe_ (11) Ti and GdFe_9Ti_2. The space group of GdFe_ (11) Ti is I4 / mmm and Z = 2, belonging to the ThMn_ (12) type structure. The lattice constant a = 0.8522nm, c = 0.4790nm and c / a = 0.562. The calculated density is 7.82 g / cm ~ 3, the measured density is 7.84g / cm ~ 3.Curie temperature is 349 ℃ .The space group of GdFe_9Ti_2 is P4 / mbm and Z = 2, belonging to Ce (Mn 0.55 Ni 0.45) ) Type structure, the lattice constant a = 0.8245nm, c = 0.4832nm, c / a = 0.586; its calculated density of 7.64g / cm ~ 3, the measured density of 7.6g / cm ~