Tracing the reactive melting of glass-forming silicate batches by in situ Na-23 NMR

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dc.contributor.author Massiot, D.
dc.contributor.author Jones, Aled R.
dc.contributor.author Florian, Pierre
dc.contributor.author Winter, Rudolf
dc.date.accessioned 2008-12-10T08:57:09Z
dc.date.available 2008-12-10T08:57:09Z
dc.date.issued 2005-02
dc.identifier.citation Massiot , D , Jones , A R , Florian , P & Winter , R 2005 , ' Tracing the reactive melting of glass-forming silicate batches by in situ Na-23 NMR ' Journal of Physical Chemistry B , vol 109 , no. 10 , pp. 4324-4332 . en
dc.identifier.issn 1520-6106
dc.identifier.other PURE: 89938
dc.identifier.other dspace: 2160/1498
dc.identifier.uri http://hdl.handle.net/2160/1498
dc.identifier.uri http://pubs.acs.org/cgi-bin/abstract.cgi/jpcbfk/2005/109/i10/abs/jp045705s.html en
dc.description Winter, Rudolf; Jones, A.R.; Florian, P.; Massiot, D., (2005) 'Tracing the reactive melting of glass-forming silicate batches by in situ Na-23 NMR', Journal of Physical Chemistry B 109(10) pp.4324-4332 RAE2008 en
dc.description.abstract The kinetics of the reaction of batches of powdered quartz and sodium carbonate was studied by in situ 23Na nuclear magnetic resonance (NMR) spectroscopy using a laser-heated probe. We show for the first time that the technique allows one to study solid-state reactions at high temperatures with good time resolution and without the risk of quenching artifacts. The reaction is controlled by solid-state Na+ diffusion across the grain interface. Independent of the batch composition, the first reaction product is crystalline sodium metasilicate, Na2SiO3, even if the temperature is high enough for much of the composition space between silica and metasilicate to be above the equilibrium liquidus. Fast Na+ diffusion allows the reaction front to cross the grain interface and form the solid product before liquid intermediate equilibrium products can be formed. This purely solid-state reaction slows down as the thickness of the interface increases; the reaction is more deceleratory than published models suggest. If excess quartz is present, it reacts in a second step involving a liquid film wetting the excess grains. Once this reaction has started, it pulls the reaction into the thermodynamic regime, which leads to an increase even in the rate of the first step leading to intermediate solid metasilicate. en
dc.format.extent 9 en
dc.language.iso eng
dc.relation.ispartof Journal of Physical Chemistry B en
dc.title Tracing the reactive melting of glass-forming silicate batches by in situ Na-23 NMR en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.1021/jp045705s
dc.contributor.institution Institute of Mathematics & Physics (ADT) en
dc.contributor.institution Mathematics and Physics en
dc.description.status Peer reviewed en


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