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An Amorphous Phase of Zinc and Silicon at Composition Zn2Si5(:H, OH)

MPG-Autoren
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Feng,  Xian-Juan
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Böhme,  Bodo
Bodo Böhme, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Bobnar,  Matej
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Simon,  Paul
Paul Simon, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Carrillo-Cabrera,  Wilder
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Burkhardt,  Ulrich
Ulrich Burkhardt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Schmidt,  Marcus
Marcus Schmidt, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Schwarz,  Ulrich
Ulrich Schwarz, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Baitinger,  Michael
Michael Baitinger, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Grin,  Yuri
Juri Grin, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Zitation

Feng, X.-J., Böhme, B., Bobnar, M., Simon, P., Carrillo-Cabrera, W., Burkhardt, U., et al. (2017). An Amorphous Phase of Zinc and Silicon at Composition Zn2Si5(:H, OH). Zeitschrift für anorganische und allgemeine Chemie, 643, 106-113. doi:10.1002/zaac.201600340.


Zitierlink: https://hdl.handle.net/11858/00-001M-0000-002D-09EC-D
Zusammenfassung
An amorphous phase at composition Zn2Si5(:H,OH) was prepared by oxidation of the precursor phase Li2ZnSi at 80 degrees 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 degrees C, amorphous Zn2Si5(:H,OH) decomposed into crystalline Zn and -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 Zn2Si5 bulk is terminated by Si-OH and Si-H groups. The absence of Knight shift in the Si-29 NMR signal assigned to Zn2Si5(:H,OH) suggests semiconducting behavior.