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An Amorphous Phase of Zinc and Silicon at Composition Zn 2 Si 5 (:H, OH)
Author(s) -
Feng Xianjuan,
Böhme Bodo,
Bobnar Matej,
Simon Paul,
CarrilloCabrera Wilder,
Burkhardt Ulrich,
Schmidt Marcus,
Schwarz Ulrich,
Baitinger Michael,
Straßner Thomas,
Grin Yuri
Publication year - 2017
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201600340
Subject(s) - amorphous solid , raman spectroscopy , high resolution transmission electron microscopy , zinc , annealing (glass) , aqueous solution , spectroscopy , analytical chemistry (journal) , silicon , phase (matter) , crystallography , inorganic chemistry , chemistry , materials science , nuclear chemistry , transmission electron microscopy , organic chemistry , nanotechnology , physics , quantum mechanics , optics , composite material
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.
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