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Determination of Activities of Niobium in Cu-Nb Melts Containing Dilute Nb
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Micro-Modelling.ORCID iD: 0000-0002-3548-8638
2015 (English)In: Metallurgical and materials transactions. B, process metallurgy and materials processing science, ISSN 1073-5615, E-ISSN 1543-1916, Vol. 46, no 2, 533-536 p.Article in journal (Refereed) Published
Abstract [en]

The activity coefficients of niobium in Cu-Nb melts were measured by equilibrating solid NbO2 with liquid copper under controlled oxygen potentials in the temperature range of 1773 K to 1898 K (1500 degrees C to 1625 degrees C). Either CO-CO2 gas mixture or H-2-CO2 gas mixture was employed to obtain the desired oxygen partial pressures. Cu-Nb system was found to follow Henry's law in the composition range studied. The temperature dependence of Henry's constant in the Cu-Nb melts could be expressed as follows: log gamma(0)(Nb(l)) = 3305/T + 0.72. The partial molar excess Gibbs energy change of niobium in Cu-Nb melts can be expressed as follows: Delta(G) over bar (ex)(Nb) = 63,280 + 13.2T(J/mol)

Place, publisher, year, edition, pages
2015. Vol. 46, no 2, 533-536 p.
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Metallurgy and Metallic Materials
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URN: urn:nbn:se:kth:diva-165205DOI: 10.1007/s11663-015-0312-3ISI: 000351860300001Scopus ID: 2-s2.0-84923340980OAI: oai:DiVA.org:kth-165205DiVA: diva2:810501
Note

QC 20150507

Available from: 2015-05-07 Created: 2015-04-24 Last updated: 2017-12-04Bibliographically approved

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