Thermodynamic approach to physical properties of silicate melts

↓ Direkt till sidans innehåll
↓ Direkt till sidans sekundära innehåll (sidomenyn)

Sökning: WFRF:(Aune Ragnhild E.) > (2005-2009) > Thermodynamic appro...

Aune, Ragnhild E.KTH,Materialens processvetenskap (författare)

Thermodynamic approach to physical properties of silicate melts

Artikel/kapitelEngelska2005

Förlag, utgivningsår, omfång ...

2013-07-18
Informa UK Limited,2005
printrdacarrier

Nummerbeteckningar

LIBRIS-ID:oai:DiVA.org:kth-14699
https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-14699URI
https://doi.org/10.1179/174328105x23905DOI

Kompletterande språkuppgifter

Språk:engelska
Sammanfattning på:engelska

Ingår i deldatabas

SwePubSwePub

Klassifikation

Ämneskategori:ref swepub-contenttype
Ämneskategori:art swepub-publicationtype

Anmärkningar

QC 20100525
The thermophysical properties of silicate melts are strongly structure dependent. It is well known that the viscosity of slags increases with increasing degree of polymerisation of the silicate anion. Even the thermodynamic properties of slags are dependent on the species type and population in the melt. Thus, a link between the thermophysical and thermochemical properties of silicate melts is logically expected. The present paper elucidates the salient features of Darken's excess stability approach to the Gibbs energy of solution as applied to the viscosities of silicate melts. It is demonstrated that the second derivatives of the viscosities of binary silicate melts with respect to composition indicate maxima corresponding to the existence of stable compounds in these systems. The concept has been successfully applied to the following systems: Al2O3-SiO2, CaO-SiO2, FeO-SiO2, MgO-SiO2 and MnO-SiO2. In all cases, the second derivative plots of viscosities with respect to composition show peaks corresponding to the metasilicates. The second derivatives of the activation energies of viscous flow with respect to temperature have earlier been shown to reflect the formation of associates/embryos in homogeneous silicate melts, indicating the readiness of the melt to separate a solid phase. Thermodynamic coupling of thermal diffusivities in the case of the CaO-Al2O3-SiO2 system from laser flash measurements of these slags, as a function of temperature, has been examined as part of the present study. Densities have been estimated from integral molar enthalpies in the case of silicate systems, and the results are presented.

Ämnesord och genrebeteckningar

silicate melts
viscosity
activation energy
thermal diffusivity
density
thermal-diffusivity measurements
viscosity
system
slags

Biuppslag (personer, institutioner, konferenser, titlar ...)

Hayashi, M. (författare)
Sridhar, S. (författare)
KTHMaterialens processvetenskap (creator_code:org_t)

Sammanhörande titlar

Ingår i:Ironmaking & steelmaking: Informa UK Limited32:2, s. 141-1500301-92331743-2812

Internetlänk

Hitta via bibliotek

Ironmaking & steelmaking (Sök värdpublikationen i LIBRIS)

Till lärosätets databas

Hitta mer i SwePub

Av författaren/redakt...: Aune, Ragnhild E ...; Hayashi, M.; Sridhar, S.

Artiklar i publikationen: Ironmaking & ste ...

Av lärosätet: Kungliga Tekniska Högskolan

Sök utanför SwePub

Sök vidare i:: Google; Google Book Search; Google Scholar

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

LIBRIS.kb.se