Jacob, K. T. ; Toguri, J. M. (1978) Thermodynamics of oxide-sulfate melts: the system PbO-PbSO4 Metallurgical and Materials Transactions B, 9 (2). pp. 301-306. ISSN 1073-5615
Full text not available from this repository.
Official URL: http://www.springerlink.com/content/u068w4n6221141...
Related URL: http://dx.doi.org/10.1007/BF02653696
Abstract
Activities in the PbO-PbSO4 melts at 1253 K have been measured by emf and gas-equilibration techniques. The activity of PbO was directly obtained from the emf of the solid oxide cell, Pt, Ni-NiO/CaO-ZrO2/Auo.92PbO.08, PbOx-PbSO4(1-x), Ir, Pt for 1.0 >XPbO > 0.6. The melt and the alloy were contained in closed zirconia crucibles. Since the partial pressure of SO2 gas in equilibrium with the melt and alloy was appreciable (>0.08 atm) atXPbO < 0.6, activities at lower PbO concentrations were derived from measurements of the weight gain of pure PbO under controlled gas streans of Ar + SO2 + O2. The partial and integral free energies of mixing at 1253 K were calculated and found to fit a subregular model: ΔGEPbO =X2PbSO4 {-42,450 + 20,000X2PbSO4} J mol-1 ΔGEPbO =X2pbSO {-12,450 - 20,000XPbS} J mol-1 ΔGEpbSOXPbSO4 {-32,450XPbS - 22,450XPbSO4 } J mol-1. The standard free energy of formation of liquid PbSO4 from pure liquid PbO and gaseous SO3 at 1 atm at 1253 K was evaluated as -88.02 (±0.72) kJ mol-1.
Item Type: | Article |
---|---|
Source: | Copyright of this article belongs to The Minerals, Metals & Materials Society. |
ID Code: | 94778 |
Deposited On: | 05 Oct 2012 10:43 |
Last Modified: | 05 Oct 2012 10:43 |
Repository Staff Only: item control page