Activity coefficient of AgO0.5 in PbO-NaO0.5 and PbO-CaO melts at 1273 K

Shigeru Ueda, Tomomasa Kumagai, Katsunori Yamaguchi

Research output: Contribution to journalArticlepeer-review


The equilibration of a Ag-Pb-based melt with PbO-NaO0.5 and PbO-CaO melts at 1273 K was investigated. A chemical equilibrium technique was used to carry out measurements. The oxygen partial pressure was measured by an electromotive force (EMF) method. The activity coefficient of AgO0.5 in the PbO-NaO0.5 and PbO-CaO melts and that of PbO in the PbO-NaO0.5 melt was derived. The addition of NaO0.5 to the PbO-based melt resulted in a slight decrease in the activity coefficient of AgO0.5. However, the activity coefficient of PbO decreased remarkably with an increase in the concentration of NaO0.5 in the PbO-based melt. Therefore, improved phase separation of Ag from the PbO-based melt was achieved by the addition NaO0.5. The addition of CaO in the PbO-based melt did not cause any change in the activity coefficient of AgO0.5.

Original languageEnglish
Pages (from-to)1457-1461
Number of pages5
JournalMaterials Transactions
Issue number6
Publication statusPublished - 2009 Jun


  • Activity coefficient of AgO
  • CaO
  • NaO
  • PbO
  • Phase separation
  • Silver-lead alloy
  • Thermodynamics

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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