日本金属学会誌

J. Japan Inst. Metals, Vol. 41, No. 9 (1977),
pp. 855-865

Activities of PbO in Binary and Ternary Silicate Melts

Yoshiaki Ouchi1 and Eiichi Kato2

1The Casting Research Laboratory, Waseda University, Tokyo
2Department of Metallurgical Engineering, Faculty of Science and Engineering, Waseda University, Tokyo

Abstract:

The Knudsen cell-mass spectrometer combination is used to study the thermodynamic properties of liquid PbO-SiO2, PbO-CaO-SiO2, PbO-MgO-SiO2, PbO-BaO-SiO2, PbO-NiO-SiO2, and PbO-CoO-SiO2 systems. First, the activities of PbO in binary melts are determined in the temperature range from 800 to 1020°C by application of the monomer-dimer technique. The results obtained are in good agreement with the previous results obtained by other methods. Second, the ratios of the activities of PbO in the ternary silicate melts containing 50 mol% SiO2 to that in the corresponding binary silicate melt are determined by the same technique in the temperature range from 1050 to 1250°C.
The obtained results are discussed on the basis of the thermodynamic model of silicate melts derived by the application of a quasi-chemical treatment to the random network model of silicates. The results obtained indicate that the standard free energy change of reaction (1) of a ternary melt is not


(Received 1976/11/15)

Keywords:


PDF(Free)PDF (Free)     Table of ContentsTable of Contents

Please do not copy without permission.