Reinvestigation of the Ce–Co–Al ternary system: Isothermal section at 973 K

Highlights: • The experimental isothermal section at 973 K of the Ce–Co–Al system is presented. • This section contains 5 ternary phases and 7 ternary extensions of pseudo-binaries. • DTA experiments are used to estimate the liquid areas. - Abstract: The Ce–Co–Al ternary phase diagram has been reinvestigated at 973 K by means of powder X-ray diffraction, scanning electron microscopy, energy dispersive spectroscopy and differential thermal analyses. It contains 5 ternary phases (CeCo₂Al₈, Ce₂Co₆Al₁₉, CeCoAl₄, Ce₃Co₃Al₄ and CeCoAl) as well as 7 extensions in the ternary field of pseudo-binaries (CeAl_2−xCo_x with 0 ⩽ x ⩽ 0.18; CeCo_2−xAl_x with 0 ⩽ x ⩽ 0.21; CeCo_3−yAl_y with 0 ⩽ y ⩽ 0.20; Ce₂Co_7−xAl_x with 0 ⩽ x ⩽ 0.73; Ce₅Co_19−yAl_y with 0 ⩽ y ⩽ 0.20; CeCo_5−xAl_x with 0 ⩽ x ⩽ 0.71 and Ce₂Co_17−yAl_y with 0 ⩽ y ⩽ 2.2). Two liquid areas are present at the Al and Ce-rich corners of this isothermal section