Coordination changes in magnesium silicate glasses

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dc.contributor.author Wilding, Martin C.
dc.contributor.author Benmore, C. J.
dc.contributor.author Tangeman, J. A.
dc.contributor.author Sampath, S.
dc.date.accessioned 2008-12-08T16:57:51Z
dc.date.available 2008-12-08T16:57:51Z
dc.date.issued 2004-07
dc.identifier.citation Wilding , M C , Benmore , C J , Tangeman , J A & Sampath , S 2004 , ' Coordination changes in magnesium silicate glasses ' Europhysics Letters , vol 67 , no. 2 , pp. 212-218 . en
dc.identifier.issn 0295-5075
dc.identifier.other PURE: 89108
dc.identifier.other dspace: 2160/1452
dc.identifier.uri http://hdl.handle.net/2160/1452
dc.description Wilding, Martin; Benmore, C.J.; Tangeman, J.A.; Sampath, S., (2004) 'Coordination changes in magnesium silicate glasses', Europhysics Letters 67 pp.212-218 RAE2008 en
dc.description.abstract Glasses made from the magnesium silicate minerals enstatite (MgSiO3) and forsterite (Mg2SiO4) and three intermediate compositions can be considered as analogues of quenched melts from the Earth and Lunar mantle. Combined neutron and X-ray diffraction data show an abrupt change in glass structure in the narrow compositional range 38% SiO2 to 33% SiO2 (Mg2SiO4). These structural changes reflect a change from a glass characterized by corner-shared SiO4 tetrahedra and an approximately equal mixture of MgO4 and MgO5 polyhedra, to one in which the average coordination of magnesium by oxygen is increased from 4.5 ± 0.1 to 5.0 ± 0.1. Both these local environments are very different from that of their crystalline counterparts. The change in structure is associated with a discontinuous change in the rheological properties of these glass-forming liquids close to the forsterite composition. en
dc.format.extent 7 en
dc.language.iso eng
dc.relation.ispartof Europhysics Letters en
dc.title Coordination changes in magnesium silicate glasses en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.1209/epl/i2003-10286-8
dc.contributor.institution Institute of Mathematics & Physics (ADT) en
dc.contributor.institution Materials Research en
dc.description.status Peer reviewed en


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