SrIrIn₆ – An Intergrowth of SrIrIn₄ with Indium Slabs

Abstract

The indium‐rich intermetallic compound SrIrIn6 was synthesized from the elements in a sealed tantalum ampoule at 1173 K, followed by slow cooling for crystal growth. SrIrIn6 crystallizes with a new structure type which was characterized by X‐ray powder and single crystal diffraction: Pmma, a = 852.34(2), b = 434.54(5), c = 1059.18(6) pm, wR2 = 0.0178, 884 F2 values, and 32 variables. The SrIrIn6 structure shows two basic building units: (i) Ir@In9 tricapped trigonal prisms (261–292 pm Ir–In) and (ii) distorted bcc In@In8 cubes (301 to 329 pm In–In). The strontium cations fill cages within the complex three‐dimensional [IrIn6] network and have coordination number 13 (Sr@In13) in form of a tricapped pentagonal prism. The SrIrIn6 structure can be described as a simple intergrowth variant of SrIrIn4 (LaCoAl4 type) with indium slabs. The crystal chemical similarities with the structures of SrIrIn4, SrIr2In8 and Eu3Ir2In15 are discussed.

EuIrIn4 with LaCoAl4 Type Structure – Synthesis, Magnetic Properties, and 151Eu Mössbauer Spectroscopy

“…The sample was finally kept at that temperature for ARTICLE Figure 1. The In@In 8 units in the structures of elemental indium, [1] CaPtIn 4 , [7] YbRhIn 5 , [8] Yb 2 IrIn 8 , [9] SrRh 2 In 8 , [10] SrIrIn 6 , [11] Ba 2 Ir 4 In 13 [12] and Eu 3 Rh 2 In 15 . [13] The site symmetries, atom designations, relevant In-In distances and the averaged c/a ratios are indicated.…”

“…In ternary compounds, the distorted bct In@In 8 units need to adjust to the substructures formed with the rare earth and transition metal atoms. As an example we present the In@In 8 units in elemental indium, [1] CaPtIn 4 , [7] YbRhIn 5 , [8] Yb 2 IrIn 8 , [9] SrRh 2 In 8 , [10] SrIrIn 6 , [11] Ba 2 Ir 4 In 13 , [12] and Eu 3 Rh 2 In 15 [13] in Figure 1. As is evident from the site symmetries given in that Figure, ratio for each In@In 8 unit.…”

Tin‐rich stannides CePd2Sn3, REPd2Sn4, Pr2Pd4Sn7 and RE3Pd6Sn10 – Crystal chemistry and 119Sn Mössbauer spectroscopy

“…An overview of structure types with differently connected square pyramids was given recently when discussing the new stannides RE 2 Au 3 Sn 6 which contain Au@Sn 5 units. [33] It is interesting to note, that the binary stannides PdSn 2 , PdSn 3 and PdSn 4 [34] 3); however, we need to consider that PrPd 2 Sn 3 is not known.…”

“…An overview of structure types with differently connected square pyramids was given recently when discussing the new stannides RE 2 Au 3 Sn 6 which contain Au@Sn 5 units. [33] It is interesting to note, that the binary stannides PdSn 2 , PdSn 3 and PdSn 4 [34] all contain Pd@Sn 8 square antiprisms as central building units with 278-284 pm PdÀ Sn. The slightly longer PdÀ Sn distances are a consequence of the larger coordination number.…”

Structure, Magnetic Properties, and 151Eu Mössbauer Spectra of the Indium‐rich Phase Eu3Rh2In15

“…No isotypic strontium analogs have been reported. Instead, phase analytical studies revealed the indium‐rich phase SrIrIn 6 [ 25 ] with its own structure type. Our ongoing phase analytical studies in the indium‐rich parts of the Eu‐ T ‐In ( T = Co, Rh, Ir) phase diagrams now revealed the missing link Eu 3 Rh 2 In 15 , whose structure, magnetic properties and 151 Eu Mössbauer spectra are reported herein.…”