Use of solid-electrolyte galvanic cells to determine the activity of CaO in the CaO-ZrO{sub 2} system and the standard Gibbs free energies of formation of CaZrO{sub 3} from CaO and ZrO{sub 2}
- Nippon Inst. of Tech., Saitama (Japan). Dept. of Mechanical Engineering
- Tokyo Inst. of Tech. (Japan). Dept. of Metallurgical Engineering
Ultraclean steel is deoxidized by the addition of aluminum, followed by desulfurizing and deoxidizing by the addition of calcium and zirconium. As a result of the deoxidation and desulfurization of molten steel, considerable oxide and sulfide inclusions are produced. The activity of CaO in the CaO-ZrO{sub 2} system has been measured at 1,572 to 1,877 K with a galvanic cell composed of 4CaO {center_dot} P{sub 2}O{sub 5} as the solid electrolyte. The activity ZrO{sub 2} was calculated from the activity of CaO by integrating the Gibbs-Duhem relation. From the activities of CaO and ZrO{sub 2}, the standard Gibbs free energy of formation of CaO {center_dot} ZrO{sub 2} was determined as follows: {Delta}G{sub f}{sup 0} = {minus}25,200 ({+-}150) {minus} 17.58 ({+-}0.085) T (1,633 to 1,873 K) J/mol.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 404371
- Journal Information:
- Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science, Vol. 27, Issue 4; Other Information: PBD: Aug 1996
- Country of Publication:
- United States
- Language:
- English
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