Cabrera, R.Q. and Salamat, A. and Barkalov, O.I. and Leynaud, Olivier and Hutchins, P. and Daisenberger, D. and Machon, D. and Sella, A. and Lewis, D.W. and McMillan, P.F. (2009) Pressure-induced structural transformations of the Zintl phase sodium silicide. Journal of Solid State Chemistry 182 (9), pp. 2535-2542. ISSN 0022-4596.Full text not available from this repository.
The high-pressure behaviour of NaSi has been studied using Raman spectroscopy and angle-dispersive synchrotron X-ray diffraction to observe the onset of structural phase transformations and potential oligomerisation into anionic Si nanoclusters with extended dimensionality. Our studies reveal a first structural transformation occurring at 8–10 GPa, followed by irreversible amorphisation above 15 GPa, suggesting the formation of Si–Si bonds with oxidation of the Si− species and reduction of Na+ to metallic sodium. We have combined our experimental studies with DFT calculations to assist in the analysis of the structural behaviour of NaSi at high pressure.
|Keyword(s) / Subject(s):||Sodium silicide; Zintl phase; High-pressure transition; Synchrotron X-ray diffraction, pressure-induced amorphisation, Raman spectroscopy, density functional calculation|
|School or Research Centre:||Birkbeck Schools and Research Centres > School of Science > Biological Sciences|
|Date Deposited:||27 Jul 2011 09:26|
|Last Modified:||17 Apr 2013 12:21|
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