High temperature calorimetric studies of heat of solution of NiO, CuO, La2O3, TiO2, HfO2 in sodium silicate liquids

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dc.contributor.author Linard, Yannick
dc.contributor.author Wilding, Martin C.
dc.contributor.author Navrotsky, Alexandra
dc.date.accessioned 2010-01-19T11:10:45Z
dc.date.available 2010-01-19T11:10:45Z
dc.date.issued 2008-01-15
dc.identifier.citation Linard , Y , Wilding , M C & Navrotsky , A 2008 , ' High temperature calorimetric studies of heat of solution of NiO, CuO, La2O3, TiO2, HfO2 in sodium silicate liquids ' Geochimica et Cosmochimica Acta , vol 72 , no. 2 , pp. 590-601 . en
dc.identifier.issn 0016-7037
dc.identifier.other PURE: 143693
dc.identifier.other dspace: 2160/3999
dc.identifier.uri http://hdl.handle.net/2160/3999
dc.description Linard, Y., Wilding, M. C., Navrotsky, A. (2007) High temperature calorimetric studies of heat of solution of NiO, CuO, La2O3, TiO2, HfO2 in sodium silicate liquids. Geochimica et Cosmochimica Acta, 72 (2), 590-601 Sponsorship: U.S. National Science Foundation (Grant EAR-0229332) en
dc.description.abstract The enthalpies of solution of La2O3, TiO2, HfO2, NiO and CuO were measured in sodium silicate melts at high temperature. When the heat of fusion was available, we derived the corresponding liquid–liquid enthalpies of mixing. These data, combined with previously published work, provide insight into the speciation reactions in sodium silicate melts. The heat of solution of La2O3 in these silicate solvents is strongly exothermic and varies little with La2O3 concentration. The variation of heat of solution with composition of the liquid reflects the ability of La(III) to perturb the transient silicate framework and compete with other cations for oxygen. The enthalpy of solution of TiO2 is temperature-dependent and indicates that the formation of Na–O–Si species is favored over Na–O–Ti at low temperature. The speciation reactions can be interpreted in terms of recent spectroscopic studies of titanium-bearing melts which identify a dual role of Ti4+ as both a network-former end network-modifier. The heats of solution of oxides of transition elements (Ni and Cu) are endothermic, concentration-dependent and reach a maximum with concentration. These indicate a charge balanced substitution which diminishes the network modifying role of Na+ by addition of Ni2+ or Cu2+. The transition metal is believed to be in tetrahedral coordination, charge balanced by the sodium cation in the melts. en
dc.format.extent 12 en
dc.language.iso eng
dc.relation.ispartof Geochimica et Cosmochimica Acta en
dc.subject TITANIUM COORDINATION en
dc.subject STRUCTURAL ENVIRONMENT en
dc.subject GEOCHEMICAL IMPLICATIONS en
dc.subject MODEL en
dc.subject COORDINATION CHEMISTRY en
dc.subject SPECTRA en
dc.subject TRANSITION en
dc.subject GLASS MELT SYSTEMS en
dc.subject AMBIENT en
dc.subject TI(IV) en
dc.title High temperature calorimetric studies of heat of solution of NiO, CuO, La2O3, TiO2, HfO2 in sodium silicate liquids en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.1016/j.gca.2007.10.004
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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