Ce–Ti–Ge system at 1170 K

Phase equilibria in the Ce–Ti–Ge system were investigated by X-ray powder diffraction, electron probe X-ray analysis and the isothermal section at 1170 K was obtained. We confirmed the CeFeSi-type CeTiGe compound (a=0.4135 (1) nm, c=0.7921 (1) nm, space group P4/nmm, No. 129). A new compound, Ce₂₀Ti₂₀Ge₆₀, was found (a=0.3967(6) nm, c=6.054 (2) nm, space group P4). It is obvious that the ThSi₂-type Ce₃₃Ti₇Ge₅₄ compound (a=0.4217 (1) nm, c=1.4184 (3) nm, space group I4₁/amd, No. 141) belongs to the extended solid solution region of the ThSi₂-type CeGe₂ compound.