Abstract
New ternary germanides R2T3Ge5 have been prepared at 1173 K. From their X-ray powder diagrams, some of them are isostructural with U2Co3Si5: R2Ru3Ge5 (R = Y, La-Sm, Gd-Tm), Ce2Co3Ge5, R2Rh3Ge5 (R = La-Pr) and R2Ir3Ge5 (R = Y, La-Sm, Gd-Dy); others crystallize with the Lu2Co3Si5 - type structure, a monoclinic deformation variant of the U2Co3Si5 type: R2Co3Ge5 (R = Y, Pr-Sm, Gd-Er) and R2Rh3Ge5 (R = Y, Nd, Sm, Gd-Tm). The Lu2Co3Si5-type structure of Ho2Rh3Ge5 was refined from single-crystal X-ray data to a conventional R value of 0.034 for 371 independent reflections (Rw = 0.034). Superconductivity above 1.3 K was found only in Y2Ir3Ge5.
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