| Autor: |
Scherf, LM, Pecher, O, Griffith, KJ, Haarmann, F, Grey, CP, Fässler, TF |
| Jazyk: |
angličtina |
| Rok vydání: |
2016 |
| Předmět: |
|
| DOI: |
10.17863/cam.1673 |
| Popis: |
The Zintl phases K₄₋ₓNaₓSi₄ (1 ≤ x ≤ 2.2) and K₇NaSi₈ are the first representatives of the K–Na–Si system, and both contain tetrahedral [Si₄]⁴⁻ clusters and a charge-balancing number of K⁺ and Na⁺ cations. All phases of K₄₋ₓNaₓSi₄ (1 ≤ x ≤ 2.2) crystallize in a new structure type with space group P2₁/n, as determined by single-crystal X-ray diffraction analysis of the parent phase K₃NaSi₄. Rietveld refinement of the X-ray diffraction data showed that the solid solutions follow Vegard's rule. K₇NaSi₈ can only be synthesized by diffusion-controlled reaction of binary precursors and is isostructural with known A₇A′T₈ (A = Na–Cs; A′ = Li, Na; T = Si, Ge) phases. A combination of solid-state NMR investigations and quantum mechanical calculations served to show the anisotropic chemical bonding behavior of all the atoms in K₇NaSi₈, which is additionally compared with the related phases A₇NaSi₈ (A = Rb, Cs). |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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