Polyamorphism in aluminate liquids

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dc.contributor.author McMillan, Paul F.
dc.contributor.author Wilson, Mark
dc.contributor.author Wilding, Martin C.
dc.date.accessioned 2008-12-10T09:16:38Z
dc.date.available 2008-12-10T09:16:38Z
dc.date.issued 2003
dc.identifier.citation McMillan , P F , Wilson , M & Wilding , M C 2003 , ' Polyamorphism in aluminate liquids ' Journal of Physics: Condensed Matter , vol 15 , no. 36 , pp. 6105-6121 . en
dc.identifier.issn 0953-8984
dc.identifier.other PURE: 89868
dc.identifier.other dspace: 2160/1503
dc.identifier.uri http://hdl.handle.net/2160/1503
dc.description McMillan, P. F., Wilson, M., Wilding, M. C. (2003). Polyamorphism in aluminate liquids. Journal of Physics: Condensed Matter, 15 (36), 6105-6121 RAE2008 en
dc.description.abstract Supercooled liquids in the Y2O3–Al2O3 system undergo a liquid–liquid phase transition between a high-temperature, high-density amorphous polymorph (HDA form), and one with lower density that is stable at lower temperature (LDA form). The two amorphous polymorphs have the same chemical composition, but they differ in their density (~4% density difference), and in their heat content (enthalpy) and entropy determined by calorimetry. Here we present new results of structural studies using neutron and high-energy x-ray diffraction to study the structural differences between high-density amorphous (HDA) and low-density amorphous (LDA) polyamorphs. The combined data sets show no large differences in the average nearest-neighbour Al–O or Y–O bond lengths or coordination numbers between the low-and high-density liquids. However, the data indicate that changes occur among the packing geometries and clustering of the Al–O and Y–O coordination polyhedra, i.e., within the second-nearest-neighbour shell defined by the metal–metal (i.e., Y–Y, Y–Al and Al–Al) interactions. Polarizable ion molecular dynamics simulations of Y2O3–Al2O3 liquids are used to help interpret the pair-correlation functions obtained from x-ray and neutron scattering data. Unexpectedly large density fluctuations are observed to occur during the simulation, that are interpreted as due to dynamic sampling of high-and low-density configurations within the single-phase liquid at temperatures above the critical point or phase transition line. Calculated partial radial distribution functions indicate that the primary differences between HDA and LDA configurations occur among the Y–Y correlations. en
dc.format.extent 17 en
dc.language.iso eng
dc.relation.ispartof Journal of Physics: Condensed Matter en
dc.title Polyamorphism in aluminate liquids en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.1088/0953-8984/15/36/303
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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