Phase equilibria in the Tb-Ti-Ge system at 1070 K

Abstract Physico-chemical analysis techniques, including X-ray phase analysis, electron probe X-ray analysis, differential thermal analysis and metallographic analysis were employed in constructing the isothermal section of the Tb–Ti–Ge system at 1070 K. The formation of the following ternary intermetallic compounds were detected in the Tb–Ti–Ge system at 1070 K: TbTiGe (high-temperature modification of CeFeSi structure type, space group P 4/ nmm , a =0.4050(2) nm, c =0.7652(3) nm: low-temperature modification of La 2 Sb structure type, space group I 4/ mmm , a =0.4053(2) nm, c =1.5293(3) nm) and Tb 22...15 Ti 34...41 Ge 44 (Sm 5 Ge 4 structure type, space group Pnma , a =0.7019(1)...0.6889(5) nm, b =1.3457(2)...1.332(1) nm, c =0.7156(1)...0.755(1) nm). The TbGe 3.5 compound belongs to the ThGe 2 structure type (space group Cmmm , a =2.0738(4) nm, b =0.4043(1) nm, c =0.3914(1) nm). The high-temperature modification of the Th 2 Ge 3 compounds belongs to the ThSi 2 structure type (space group I 4 1 / amd , a =0.4061(2) nm, c =1.372(1) nm).