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The twelve title compounds have been prepared for the first time. Their CaCr 2 Al 10 -type structure (P4/nmm, Z = 4) was refined from single-crystal X-ray data for the three representatives TbMnAl 10  (a = 1274.3(2) pm, c = 511.4(2) pm, R = 0.025 for 680 structure factors F and 43 variable parameters V), CeRe 2 Al 10  (a = 1295.5(5) pm, c = 517.2(4) pm, R = 0.054 for 810 F and 46 V), and SmRe 2 Al 10  (a = 1291.5(2) pm, c = 516.5(1) pm, R = 0.021 for 622 F and 46 V). The atomic positions of the lanthanoid and transition metal atoms are fully occupied. Significant deviations from the full occupancies were observed for two aluminum sites in TbMn 2 Al 10  and for all five aluminum sites of the two rhenium-containing compounds, resulting in the compositions TbMn 2 Al 9.63(2) , CeRe 2 Al 9.52(8) , and SmRe 2 Al 9.16(9).  The cell volume of CeRe 2 Al 10  and to a smaller extent also that of CeMn 2 Al 10  indicate mixed or intermediate +III/+IV valencies of the cerium atoms in these compounds. The structural relationships between the three closely related body-centered tetragonal structures of ThMn 12 , CeMniAl 8 , DyFe 6 Al 6  and the primitive tetragonal structure of CaCr 2 Al 10  are briefly discussed.

Ternary Intermetallic Compounds LnMn 2 Al 10 (Ln = Y, La-Nd, Sm, Gd-Dy) and L n Re 2 Al 10 (Ln = Ce, Pr, Sm) with CaCr 2 Al 10 -Type Structure