Synthesis and Structural Characterization of ACu9Tt4 (A = Ca, Sr, Ba, Eu; Tt = Si, Ge, Sn) – Tetragonally Distorted Ternary Variants of the Cubic NaZn13 Structure Type. Improved Structure Refinement of SrCu2Ge2

Schäfer, M.; Yamasaki, Yoshio; Fritsch, V.; Bobev, Svilen

doi:10.1002/zaac.201200062

Cited by 4 publications

(1 citation statement)

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“…The described representation of the structure provides visualization of the local coordination environment for the cation sites. The AE –Ge contacts for all studied compounds fall in the typical range of bonding distances found in other AE germanides. ,,,,− The octahedral coordination of the AE atoms in AE Li 2 In 2 Ge 2 can be extended by including the six In atoms from the adjacent [Li 2 In 2 ] slabs (Figure b, top left). The corresponding AE –In distances are somewhat longer than the typical bonding contacts (Table ).…”

Section: Resultsmentioning

confidence: 79%

Layered Quaternary Germanides—Synthesis and Crystal and Electronic Structures of AELi₂In₂Ge₂ (AE = Sr, Ba, Eu)

Ovchinnikov

Bobev

2019

Inorg. Chem.

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Three new quaternary germanides with the composition AELi2In2Ge2 (AE = Sr, Ba, Eu) have been synthesized and structurally characterized. The layered crystal structure of these phases features homoatomic In–In bonding, but there are no direct Ge–Ge bonds. Such a crystallographic arrangement can be regarded as an ordered quaternary derivative of the CaCu4P2 structure (trigonal syngony, Pearson code hR7). Comprehensive analysis of the structural genealogy suggests relationships with the structures of other layered pnictides and chalcogenides, which are discussed. Partitioning of the available valence electrons and the assignment of the formal charges indicate that the composition of the new germanides is charge-balanced. First-principles calculations and electrical transport measurements indicate poor metallic behavior, resulting from significant hybridization of the electronic states.

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Section: Resultsmentioning

confidence: 79%

Layered Quaternary Germanides—Synthesis and Crystal and Electronic Structures of AELi₂In₂Ge₂ (AE = Sr, Ba, Eu)

Ovchinnikov

Bobev

2019

Inorg. Chem.

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ChemInform Abstract: Synthesis and Structural Characterization of ACu₉Tt₄ (A: Ca, Sr, Ba, Eu; Tt: Si, Ge, Sn) — Tetragonally Distorted Ternary Variants of the Cubic NaZn₁₃ Structure Type. Improved Structure Refinement of SrCu₂Ge₂.

et al. 2012

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Clathrate formation in the systems Sr–Cu–Ge and {Ba,Sr}–Cu–Ge

Zeiringer

Moser

Kneidinger

et al. 2014

Journal of Solid State Chemistry

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In the ternary system Sr-Cu-Ge, a clathrate type-I phase, Sr 8 Cu 5.3 Ge 40.7 (a = 1.06311(3), exists close to the Zintl limit in a small temperature interval. Sr 8 Cu 5.3 Ge 40.7 decomposes eutectoidally on cooling at 730°C into (Ge), SrGe 2 and  1 -SrCu 2-x Ge 2+x . Phase equilibria at 700°C have been established for the Ge rich part and are characterized by the appearance of only one ternary compound,  1 -SrCu 2-x Ge 2+x , which crystallizes with the ThCr 2 Si 2 structure type and forms a homogeneity range up to x=0.4 (a = 0.42850(4), c = 1.0370(1) nm).Additionally, the extent of the clathrate type-I solid solution Ba 8-x Sr x Cu y Ge 46-y (5.2  y  5.4) has been studied at various temperatures. The clathrate type-I crystal structure (space group n Pm3 ) has been proven by X-ray single crystal diffraction on two single crystals with composition Sr 8 Cu 5.3 Ge 40.7 (a = 1.06368(2) nm) and Ba 4.9 Sr 3.1 Cu 5.3 Ge 40.7 (a = 1.06748(2) nm) measured at 300, 200 and 100 K. From the temperature dependency of the lattice parameters and the atomic displacement parameters, the thermal expansion coefficients, the Debye-and Einstein-temperatures and the speed of sound have been determined.

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Synthesis and Structural Characterization of ACu₉Tt₄ (A = Ca, Sr, Ba, Eu; Tt = Si, Ge, Sn) – Tetragonally Distorted Ternary Variants of the Cubic NaZn₁₃ Structure Type. Improved Structure Refinement of SrCu₂Ge₂

Abstract: The title compounds are synthesized from the elements using excess Cu and Si, Ge, or Sn as a flux (alumina crucibles, 1100 °C, 2 h).

Cited by 4 publications

References 52 publications

Layered Quaternary Germanides—Synthesis and Crystal and Electronic Structures of AELi₂In₂Ge₂ (AE = Sr, Ba, Eu)

Layered Quaternary Germanides—Synthesis and Crystal and Electronic Structures of AELi₂In₂Ge₂ (AE = Sr, Ba, Eu)

ChemInform Abstract: Synthesis and Structural Characterization of ACu₉Tt₄ (A: Ca, Sr, Ba, Eu; Tt: Si, Ge, Sn) — Tetragonally Distorted Ternary Variants of the Cubic NaZn₁₃ Structure Type. Improved Structure Refinement of SrCu₂Ge₂.

Clathrate formation in the systems Sr–Cu–Ge and {Ba,Sr}–Cu–Ge

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Synthesis and Structural Characterization of ACu9Tt4 (A = Ca, Sr, Ba, Eu; Tt = Si, Ge, Sn) – Tetragonally Distorted Ternary Variants of the Cubic NaZn13 Structure Type. Improved Structure Refinement of SrCu2Ge2

Abstract: The title compounds are synthesized from the elements using excess Cu and Si, Ge, or Sn as a flux (alumina crucibles, 1100 °C, 2 h).

Cited by 4 publications

References 52 publications

Layered Quaternary Germanides—Synthesis and Crystal and Electronic Structures of AELi2In2Ge2 (AE = Sr, Ba, Eu)

Layered Quaternary Germanides—Synthesis and Crystal and Electronic Structures of AELi2In2Ge2 (AE = Sr, Ba, Eu)

ChemInform Abstract: Synthesis and Structural Characterization of ACu9Tt4 (A: Ca, Sr, Ba, Eu; Tt: Si, Ge, Sn) — Tetragonally Distorted Ternary Variants of the Cubic NaZn13 Structure Type. Improved Structure Refinement of SrCu2Ge2.

Clathrate formation in the systems Sr–Cu–Ge and {Ba,Sr}–Cu–Ge

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Synthesis and Structural Characterization of ACu₉Tt₄ (A = Ca, Sr, Ba, Eu; Tt = Si, Ge, Sn) – Tetragonally Distorted Ternary Variants of the Cubic NaZn₁₃ Structure Type. Improved Structure Refinement of SrCu₂Ge₂

Layered Quaternary Germanides—Synthesis and Crystal and Electronic Structures of AELi₂In₂Ge₂ (AE = Sr, Ba, Eu)

Layered Quaternary Germanides—Synthesis and Crystal and Electronic Structures of AELi₂In₂Ge₂ (AE = Sr, Ba, Eu)

ChemInform Abstract: Synthesis and Structural Characterization of ACu₉Tt₄ (A: Ca, Sr, Ba, Eu; Tt: Si, Ge, Sn) — Tetragonally Distorted Ternary Variants of the Cubic NaZn₁₃ Structure Type. Improved Structure Refinement of SrCu₂Ge₂.