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The rare earth metal-rich cobalt and nickel aluminium compounds with the general compositions  RE  6 Co 2 Al ( RE =Sc, Y, Nd, Sm, Gd–Tm, Lu) and  RE  6 Ni 2.25 Al 0.75  ( RE =Y, Gd–Tm, Lu) have been synthesised from the elements by arc-melting, followed by annealing. Single-crystal X-ray diffraction experiments on Y 6 Co 2.02(1) Al 0.98(1)  (Ho 6 Co 2 Ga type;  Immm ;  a =944.1(2),  b =952.4(2),  c =999.0(2) pm;  wR 2=0.0452, 1123  F  2  values, 35 variables) and Y 6 Ni 2.26(1) Al 0.74(1)  (Ho 6 Co 2 Ga type;  Immm ;  a =938.30(5),  b =959.45(5),  c =996.05(6) pm;  wR 2=0.0499, 1131  F  2  values, 35 variables) revealed that the compounds form solid solutions according to the general formula  RE  6 (Co/Ni) 2+   x  Al 1− x   with different homogeneity ranges. The compounds of the Ni series can be obtained in X-ray pure form only with the nominal composition  RE  6 Ni 2.25 Al 0.75 . A significant increase of the  U  22  component of the anisotropic displacement parameters of the Co/Ni2 atoms (4 g  site) was observed that requires a description of the structure with a split-position model at RT. Further investigations by low temperature (90 K) single-crystal X-ray diffraction experiments of Y 6 Co 2.02(1) Al 0.98(1)  showed a significant decrease of  U  22 . Magnetic measurements were conducted on the X-ray pure members of the  RE  6 Co 2 Al ( RE =Y, Dy–Tm, Lu) series. Antiferromagnetic ordering was observed for the members with unpaired  f  electrons with Néel temperatures up to  T  N =48.0(1) K and two spin reorientations for Dy 6 Co 2 Al.

zeitschrift für naturforschung b

Two series of rare earth metal-rich ternary aluminium transition metallides –  RE  6 Co 2 Al ( RE =Sc, Y, Nd, Sm, Gd–Tm, Lu) and  RE  6 Ni 2.25 Al 0.75  ( RE =Y, Gd–Tm, Lu)