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- Title
An Amorphous Phase of Zinc and Silicon at Composition Zn<sub>2</sub>Si<sub>5</sub>(:H, OH).
- Authors
Feng, Xianjuan; Böhme, Bodo; Bobnar, Matej; Simon, Paul; Carrillo ‐ Cabrera, Wilder; Burkhardt, Ulrich; Schmidt, Marcus; Schwarz, Ulrich; Baitinger, Michael; Straßner, Thomas; Grin, Yuri
- Abstract
An amorphous phase at composition Zn2Si5(:H,OH) was prepared by oxidation of the precursor phase Li2ZnSi at 80 °C in the ionic liquid of n-dodecyltrimethylammonium chloride (DTAC) and AlCl3 in 1:1 molar ratio, followed by removal of elemental zinc by dilute aqueous HCl. The product was structurally amorphous according to HRTEM, XRPD, and Raman spectroscopy. Zn2Si5(:H,OH) forms layers embedded in a matrix of a silica by-product. On annealing at 150 °C, amorphous Zn2Si5(:H,OH) decomposed into crystalline Zn and α-Si. The decomposition comes along with the release of H2 revealed by TG-MS studies. IR and solid-state NMR spectroscopy revealed that the Zn2Si5 bulk is terminated by Si-OH and Si-H groups. The absence of Knight shift in the 29Si NMR signal assigned to Zn2Si5(:H,OH) suggests semiconducting behavior.
- Subjects
ZINC; SILICON; OXIDATION; IONIC liquids; AMMONIUM chloride; AQUEOUS solutions
- Publication
Zeitschrift für Anorganische und Allgemeine Chemie, 2017, Vol 643, Issue 1, p106
- ISSN
0044-2313
- Publication type
Article
- DOI
10.1002/zaac.201600340