In situ diffraction studies of magnesium silicate liquids

H...............H

Show simple item record

dc.contributor.author Wilding, Martin Charles
dc.contributor.author Benmore, Chris J.
dc.contributor.author Weber, J. K. Richard
dc.date.accessioned 2010-01-15T11:30:07Z
dc.date.available 2010-01-15T11:30:07Z
dc.date.issued 2008-07
dc.identifier.citation Wilding , M C , Benmore , C J & Weber , J K R 2008 , ' In situ diffraction studies of magnesium silicate liquids ' Journal of Materials Science , vol 43 , no. 14 , pp. 4707-4713 . , 10.1007/s10853-007-2356-5 en
dc.identifier.issn 0022-2461
dc.identifier.other PURE: 143426
dc.identifier.other dspace: 2160/3987
dc.identifier.uri http://hdl.handle.net/2160/3987
dc.description Wilding, M. C., Benmore, C. J., Weber, J. K. R. (2008). In situ diffraction studies of magnesium silicate liquids. Journal of Materials Science, 43 (14), 4707-4713. en
dc.description.abstract Primitive MgO–SiO2 liquids dominate the early history of the Earth and Terrestrial planets. The structures of these liquids and structure-dependent properties, such as viscosity and diffusion, are considered important in the evolution of these planets, however, MgO–SiO2 liquids are refractory and do not form glasses easily and it is difficult to measure the structure of these liquids. Container-less synthesis techniques have been used to produce glasses that range in composition from 50 to 33% SiO2, corresponding to the compositions of two important mantle minerals: enstatite and forsterite. The structure of these glasses has been determined using combined neutron and high-energy diffraction and show changes in the short-range order as a function of composition. These changes include a jump in Mg–O coordination number at the limit to the formation of the silicate network in forsterite composition glass. These results imply a similar change in the structure of the liquid. Accordingly, the structures of forsterite and enstatite liquids have been determined using high-energy X-rays and a specialized sample environment, a containerless levitator. The main qualitative structural differences between MgSiO3 and Mg2SiO4 glasses are also observed in the melt. Liquid MgSiO3 is interpreted as forming a relatively ‘strong’ network of SiO4 tetrahedra, whereas the Mg2SiO4 liquid is “fragile” and dominated MgO n (n = 4, 5, 6) polyhedra and highly mobile oxygen ions. The results differ significantly from previously reported X-ray diffraction data for liquid MgSiO3. en
dc.format.extent 7 en
dc.language.iso eng
dc.relation.ispartof Journal of Materials Science en
dc.subject COORDINATION CHANGES en
dc.subject HIGH-PRESSURE en
dc.subject VITREOUS SILICA en
dc.subject X-RAY-DIFFRACTION en
dc.subject MOLECULAR-DYNAMICS SIMULATIONS en
dc.subject PHASE en
dc.subject AMORPHOUS SIO2 en
dc.subject NEUTRON-SCATTERING en
dc.subject GLASSES en
dc.subject FORSTERITE en
dc.title In situ diffraction studies of magnesium silicate liquids en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.1007/s10853-007-2356-5
dc.contributor.institution Materials Research en
dc.contributor.institution Institute of Mathematics & Physics (ADT) en
dc.description.status Peer reviewed en


Files in this item

Files Size Format View

There are no files associated with this item.

This item appears in the following Collection(s)

Show simple item record

Search Cadair


Advanced Search

Browse

My Account