Ternary Intermetallic Compounds R26(RuxIn1-x) 17 (R = Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Lu), Pr21Ru8.2In5 and Gd6Ru2In with High Content of Rare Earth Elements

In the R-Ru-In (R-rare earth element) systems in the area with a high content of rare-earth elements (>60 at %), a number of isostructural compounds R-26(RuxIn1 - x)(17) (R = Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Lu) were found, which crystallize in a tetragonal cell (P4/mbm) with the Sm-26(Co(0.65)Ga0.35)(17) structure type, as well as Pr21Ru8.2In5 compounds in a tetragonal cell (I4/mcm) with the Y3Rh2 structure type and Gd6Ru2In in a rhombic cell (Immm) with the Ho6Co2Ga structure type. The samples were prepared by arc-melting the stoichiometric quantities of elementary components. The structures were determined by single-crystal X-ray diffraction and refined by the Rietveld method using powder patterns. Compounds R-26(RuxIn1-x)(17) (R = Dy, Ho, Er, Tm, Lu) exist in the homogeneity range 0.28 < x < 0.47. All crystal structures of the obtaining compounds are based on a frame from atoms of rare earth elements, inside which are smaller in size atoms of ruthenium and indium. A general fragment of all the considered structures are columns of various lengths from InR8 tetragonal prisms and RuR8 tetragonal antiprisms conjugated by mutual bases. The new compounds have a congruent melting pattern.