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Experimental evidence of Na2[B12H12] and Na formation in the desorption pathway of the 2NaBH4 + MgH2 system

Garroni, Sebastiano and Milanese, Chiara and Pottmaier, Daphiny and Mulas, Gabriele Raimondo Celestino and Nolis, Pau and Girella, Alessandro and Caputo, Riccarda and Olid Britos, David and Teixdor, Francesc and Baricco, Marcello and Marini, Amedeo and Suriñach, Santiago and Baró, Maria Dolores (2011) Experimental evidence of Na2[B12H12] and Na formation in the desorption pathway of the 2NaBH4 + MgH2 system. The Journal of Physical Chemistry. C, Vol. 115 (33), p. 16664-16671. eISSN 1932-7455. Article.

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DOI: 10.1021/jp202341j

Abstract

In the present work we report the desorption pathway of the 2NaBH4 + MgH2 system. Ex-situ X-ray powder diffraction (XRPD) and solid state magic angle spinning (MAS) nuclear magnetic resonance (NMR) measurements have been performed on samples heat treated up to 450 °C for different times. Ex-situ X-ray powder diffraction experiments conducted on fully desorbed samples allowed us to identify nanocrystalline MgB2 and metallic Na as dehydrogenation products. 11B and 23Na NMR analyses have been also carried out in order to evaluate the structural evolution of decomposed materials. Our measurements show that the local structure of MgB2 is influenced by replacement of Mg with Na atoms in the Mg sites. Moreover, amorphous Na2[B12H12] was detected in the partially desorbed sample and in the final products of the decomposition reaction. The presence of the [B12H12]2– anion was confirmed by both direct comparison with the 11B{1H} NMR spectrum of pure Na2[B12H12] and dynamic cross-polarization experiments.

Item Type:Article
ID Code:6420
Status:Published
Refereed:Yes
Uncontrolled Keywords:NaBH4/MgH2 multicomponent system, NMR measurements, XRPD patterns
Subjects:Area 03 - Scienze chimiche > CHIM/02 Chimica fisica
Divisions:002 Altri enti e centri di ricerca del Nord Sardegna > INSTM-Consorzio Interuniversitario Nazionale per la Scienza e la Tecnologia dei Materiali, Unità di ricerca di Sassari
001 Università di Sassari > 01 Dipartimenti > Chimica
Publisher:American Chemical Society
eISSN:1932-7455
Copyright Holders:© 2011 American Chemical Society
Deposited On:29 Aug 2011 17:01

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