Sc4T7Ge6 (T ≡; Rh, Ir, Os, Ru) and Sc4Ir7Si6 with the cubic U4Re7Si6-type structure

Engel, N.; Chabot, B.; Parthé, E.

doi:10.1016/0022-5088(84)90207-8

Cited by 25 publications

(5 citation statements)

References 4 publications

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“…The RE 4 FeGa 12 - x Ge x compounds crystallize in the U 4 Re 7 Si 6 structure type. This is a rather stable structural arrangement as a large number of isotypic ternary phases with Sc, lanthanides, , and actinides, as well as group IVA metals, are known. The RE 4 FeGa 12- x Ge x species seem to be the first quaternary analogues of the U 4 Re 7 Si 6 structure type.…”

Section: Resultsmentioning

confidence: 99%

“…The general formula for these compounds could be written as A 4 M(M‘ 6 T 6 ), where A = Sc, Ln, Ac, Zr, and Hf, M = transition metal, M‘ = transition metal or Ga, and Tt = tetrelide or Ga. The examples of those are Sc 4 M 7 Ge 6 , RE 4 M 7 Ge 6 28 (M = Ru, Os, Rh, Ir), U 4 Tc 7 Tt (Tt = Si, Ge), Np 4 Ru 7 Ge 6 , U 4 Re 7 Si 6 and M 4 Co 7 Ge 6 31 (M = Zr, Hf), and even RE 4 MGa 12 29 (RE = Ho, Tm; M = Ni, Pd).…”

Section: Resultsmentioning

confidence: 99%

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Isolation of the New Cubic Phases RE₄FeGa_12-_xGe_x (RE = Sm, Tb; x = 2.5) from Molten Gallium: Single-Crystal Neutron Diffraction Study of the Ga/Ge Distribution

et al. 2002

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The compounds RE4FeGa(12-x)Ge(x) (RE = Sm, Tb) were discovered in reactions employing molten Ga as a solvent at 850 degrees C. However, the isostructural Y4FeGa(12-x)Ge(x) was prepared from a direct combination reaction. The crystal structure is cubic with space group Imm, Z = 2, and a = 8.657(4) A and 8.5620(9) A for the Sm and Tb analogues, respectively. Structure refinement based on full-matrix least squares on F(o)2 resulted in R1 = 1.47% and wR2 = 4.13% [I > 2(I)] for RE = Sm and R1 = 2.29% and wR2 = 7.12% [I > 2(I)] for RE = Tb. The compounds crystallize in the U4Re7Si6 structure type, where the RE atoms are located on 8c (1/4, 1/4, 1/4) sites and the Fe atoms on 2a (0, 0, 0) sites. The distribution of Ga and Ge in the structure, investigated with single-crystal neutron diffraction on the Tb analogue, revealed that these atoms are disordered over the 12d (1/4, 0, 1/2) and 12e (x, 0, 0) sites. The amount of Ga/Ge occupying the 12d and 12e sites refined to 89(4)/11 and 70(4)/30%, respectively. Transport property measurements indicate that these compounds are metallic conductors. Magnetic susceptibility measurements and Mössbauer spectroscopy performed on the Tb analogue show a nonmagnetic state for Fe, while the Tb atoms carry a magnetic moment corresponding to a mu(eff) of 9.25 mu(B).

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Isolation of the New Cubic Phases RE₄FeGa_12-_xGe_x (RE = Sm, Tb; x = 2.5) from Molten Gallium: Single-Crystal Neutron Diffraction Study of the Ga/Ge Distribution

et al. 2002

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“…Four ternary phases have been reported in the System Sc-Ir-Si, but only the structures of ScIr 3 Si 7 [5] and Sc 5 Ir 4 Si 10 [6] are known from single crystal work. The structures of ScIrSi [3] and Sc 4 Ir 7 Si 6 [7] were assigned on the basis of powder patterns. This holds also for the structures of ScPdSi and ScRuSi [3].…”

Section: Introductionmentioning

confidence: 99%

New Scandium Platinum Silicides: ScPt₂Si with ‘Inverse’ MgCuAl₂ Structure and Sc₅Pt₉Si₇, a Variant of the Zr₂Fe₁₂P₇‐Type

Lorenz

Jung

2009

Zeitschrift anorg allge chemie

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Abstract. Two new scandium platinum silicides, ScPt 2 Si (orthorhombic, Cmcm, a = 3.6653(6) Å, b = 9.831(1) Å, c = 6.967(1) Å, Z = 4) and Sc 5 Pt 9 Si 7 (hexagonal, P 6, a = 9.9418(5) Å, c = 3.8832(2) Å, Z = 1) were prepared by reaction of the elements in an electric arc furnace and subsequent annealing. The crystal structures were solved and refined from single crystal diffraction data. ScPt 2 Si crystallizes with an 'inverse' MgCuAl 2 structure while Sc 5 Pt 9 Si 7 forms a variant of the Zr 2 Fe 12 P 7 type.

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“…There are two known coloring variant structure types closely resembling the title compound, having essentially the same geometrical arrangement of atoms and crystallizing in the same cubic space group Im 3̅ m . These are U 4 Re 7 Si 6 and Y 4 PdGa 12 . In the former, a Re 6 Si 6 network interpenetrates with an arrangement of Re-centered, vertex-sharing Re@U 8 cubes, while Y 4 PdGa 12 features Pd-centered Y-cubes, Pd@Y 8 , in a network of pure Ga atoms.…”

Section: Resultsmentioning

confidence: 99%

Synthesis, Crystal Structure, and Bonding Analysis of the Hypoelectronic Cubic Phase Ca₅Pd₆Ge₆

et al. 2015

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The title compound, Ca5Pd6Ge6, was obtained during a systematic investigation of the Ca-Pd-Ge ternary phase diagram. The crystal structure was determined and refined from single-crystal X-ray diffraction data. It crystallizes in a new structure variant of the Y4PdGa12-type structure (Im3̅m, a = 8.7764(4) Å) that features an arrangement of vertex-sharing body-centered cubes of calcium, Ca@Ca8, with a hierarchical bcc network, interpenetrating a second (Pd6Ge6) network consisting of Ge2 dumbbells surrounded by Pd in a strongly flattened octahedron with Pd(μ(2)-η(2),η(4)-Ge2)-like motifs. These octahedra are condensed through the Pd to form a 3D open fcc network. Theoretical band structure calculations suggested that the compound is hypoelectronic with predominantly multicenter-type interatomic interactions involving all three elements and essentially a Hume-Rothery-like regime of electronic stabilization. The similar electronegativity between germanium and palladium atoms has a decisive impact on the bonding picture of the system.

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Sc4T7Ge6 (T ≡; Rh, Ir, Os, Ru) and Sc4Ir7Si6 with the cubic U4Re7Si6-type structure

Cited by 25 publications

References 4 publications

Isolation of the New Cubic Phases RE₄FeGa_12-_xGe_x (RE = Sm, Tb; x = 2.5) from Molten Gallium: Single-Crystal Neutron Diffraction Study of the Ga/Ge Distribution

Isolation of the New Cubic Phases RE₄FeGa_12-_xGe_x (RE = Sm, Tb; x = 2.5) from Molten Gallium: Single-Crystal Neutron Diffraction Study of the Ga/Ge Distribution

New Scandium Platinum Silicides: ScPt₂Si with ‘Inverse’ MgCuAl₂ Structure and Sc₅Pt₉Si₇, a Variant of the Zr₂Fe₁₂P₇‐Type

Synthesis, Crystal Structure, and Bonding Analysis of the Hypoelectronic Cubic Phase Ca₅Pd₆Ge₆

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Sc4T7Ge6 (T ≡; Rh, Ir, Os, Ru) and Sc4Ir7Si6 with the cubic U4Re7Si6-type structure

Cited by 25 publications

References 4 publications

Isolation of the New Cubic Phases RE4FeGa12-xGex (RE = Sm, Tb; x = 2.5) from Molten Gallium: Single-Crystal Neutron Diffraction Study of the Ga/Ge Distribution

Isolation of the New Cubic Phases RE4FeGa12-xGex (RE = Sm, Tb; x = 2.5) from Molten Gallium: Single-Crystal Neutron Diffraction Study of the Ga/Ge Distribution

New Scandium Platinum Silicides: ScPt2Si with ‘Inverse’ MgCuAl2 Structure and Sc5Pt9Si7, a Variant of the Zr2Fe12P7‐Type

Synthesis, Crystal Structure, and Bonding Analysis of the Hypoelectronic Cubic Phase Ca5Pd6Ge6

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Isolation of the New Cubic Phases RE₄FeGa_12-_xGe_x (RE = Sm, Tb; x = 2.5) from Molten Gallium: Single-Crystal Neutron Diffraction Study of the Ga/Ge Distribution

Isolation of the New Cubic Phases RE₄FeGa_12-_xGe_x (RE = Sm, Tb; x = 2.5) from Molten Gallium: Single-Crystal Neutron Diffraction Study of the Ga/Ge Distribution

New Scandium Platinum Silicides: ScPt₂Si with ‘Inverse’ MgCuAl₂ Structure and Sc₅Pt₉Si₇, a Variant of the Zr₂Fe₁₂P₇‐Type

Synthesis, Crystal Structure, and Bonding Analysis of the Hypoelectronic Cubic Phase Ca₅Pd₆Ge₆