Fe₂ Pairs as Structural Units in the Indides RE₁₂Fe₂In₃ (RE = Ho, Er, Tm, Lu)

Abstract

The indides RE 12 Fe 2 In 3 (RE ϭ Ho, Er, Tm, Lu) have been prepared by arc-melting the elements and subsequent annealing. All compounds were characterized by X-ray powder diffraction and the Er 12 Fe 2 In 3 structure was refined from X-ray single crystal data: I4/mmm, a ϭ 958.8(1), c ϭ 957.8(1) pm, wR2 ϭ 0.0629, 412 F 2 values and 22 variables. The 2a site shows In/Fe mixing, leading to the composition Er 12 Fe 2.31 In 2.69 for the investigated crystal. The structure (new type) derives from a Cu

Crystal structure of RE12Fe2+xPb3−x (RE=Tm, Lu) compounds

“…The composition of samples, the reflection intensities and the calculated lattice parameters confirm that compounds crystallize in the Er 12 Fe 2 In 3 structure type (space group I4/mmm, Pearson code tI34). Crystal data and details of the structure refinements for the Tm 12 [3]. Final positions of the atoms and their thermal parameters for RE 12 Fe 2+x Pb 3−x (RE = Tm, Lu) are listed in Table 2.…”

“…The compounds with the Sm 12 Ni 6 In structure type were revealed in some RE-{Co, Ni}-In [1] and RE-{Co, Ni}-Pb [4] systems, the compounds crystallizing in the Ho 6 Co 2 Ga structure type were found in the RE-Co-In [5][6][7] and RE-{Co, Ni}-Pb [8,9] systems. The compounds with the Er 12 Fe 2 In 3 structure exist only in the systems RE-Fe-In [3]. Considering such similarity of the RE-T-In and RE-T-Pb systems we expected the formation of compounds RE 12 Fe 2 Pb 3 with the Er 12 Fe 2 In 3 type of structure.…”

“…For example, compounds crystallizing in the Sm 12 Ni 6 In (space group Im3, Pearson code cI38) [1], Ho 6 Co 2 Ga (space group Immm, Pearson code oI36) [2] and Er 12 Fe 2 In 3 (space group I4/mmm, Pearson code tI34) [3] structure types form homological series RE 3(x+y) T 2x X y (X = In, Pb; x-number of RE 3 T 2 fragments, y-number of RE 3 X fragments). The compounds with the Sm 12 Ni 6 In structure type were revealed in some RE-{Co, Ni}-In [1] and RE-{Co, Ni}-Pb [4] systems, the compounds crystallizing in the Ho 6 Co 2 Ga structure type were found in the RE-Co-In [5][6][7] and RE-{Co, Ni}-Pb [8,9] systems.…”

Synthesis and crystal structures of the new indides Dy5Pd2In and Y5Pd2In

“…The Pd atoms are surrounded by trigonal prisms of Dy atoms with two Dy and one Pd capping lateral faces: [Pd(Dy 8 Pd 1 )]. Such polyhedra, centered by transition metal atoms, are typical for the structures of RE 12 Co 6 In (Sm 12 Ni 6 Intype) [23], RE 6 Co 2 In (Ho 6 Co 2 Ga-type) [24,25], RE 12 Fe 2 In 3 (Er 12 Fe 2 In 3 -type) [26], and RE 14 Co 3 In 3 (Lu 14 Co 3 In 3 -type) [27,28] and many two-layered structures of ternary indides [1]. The coordination number of the indium atoms is equal to 10.…”

Rare earth metal-rich indides RE14Rh3−xIn3 (RE=Y, Dy, Ho, Er, Tm, Lu)

“…Empty RE 6 octahedra occur in the structure types Sm 12 Ni 6 In [6], Ho 6 Co 2 Ga [7], and Er 12 Fe 2 In 3 [8]. These octahedra are condensed via all common corners, leading to a ReO 3 -related framework.…”