An Amorphous Phase of Zinc and Silicon at Composition Zn 2 Si 5 (:H, OH)

An amorphous phase at composition Zn 2 Si 5 (:H,OH) was prepared by oxidation of the precursor phase Li 2 ZnSi at 80 °C in the ionic liquid of n ‐dodecyltrimethylammonium chloride (DTAC) and AlCl 3 in 1:1 molar ratio, followed by removal of elemental zinc by dilute aqueous HCl. The product was struc...

Full description

Saved in:
Bibliographic Details
Published in:Zeitschrift für anorganische und allgemeine Chemie (1950) 2017-01, Vol.643 (1), p.106-113
Main Authors: Feng, Xianjuan, Böhme, Bodo, Bobnar, Matej, Simon, Paul, Carrillo‐Cabrera, Wilder, Burkhardt, Ulrich, Schmidt, Marcus, Schwarz, Ulrich, Baitinger, Michael, Straßner, Thomas, Grin, Yuri
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:An amorphous phase at composition Zn 2 Si 5 (:H,OH) was prepared by oxidation of the precursor phase Li 2 ZnSi at 80 °C in the ionic liquid of n ‐dodecyltrimethylammonium chloride (DTAC) and AlCl 3 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. Zn 2 Si 5 (:H,OH) forms layers embedded in a matrix of a silica by‐product. On annealing at 150 °C, amorphous Zn 2 Si 5 (:H,OH) decomposed into crystalline Zn and α‐Si. The decomposition comes along with the release of H 2 revealed by TG‐MS studies. IR and solid‐state NMR spectroscopy revealed that the Zn 2 Si 5 bulk is terminated by Si‐OH and Si‐H groups. The absence of Knight shift in the 29 Si NMR signal assigned to Zn 2 Si 5 (:H,OH) suggests semiconducting behavior.
ISSN:0044-2313
1521-3749
DOI:10.1002/zaac.201600340