Thermodynamic Investigation on the Mn-V-O Oxide System and Gibbs Energy of Formation of MnV2O4 Spinel Solid Solution
As the first step of thermodynamic investigation on the Mn-V-O oxide system, phase equilibria of the Mn-V-O systems under controlled atmosphere have been experimentally investigated in the temperature range from 1200 to 1600°C and in the range of logpO2 from -6 to -13. The following phases have been observed; molten oxide, manganosite (MnO (s.s.)), spinel (MnV2O4 (s.s.)), and vanadium trioxide (V2O3 (s.s.)). It was found in the present study that oxygen partial pressure has a significant effect on sub-solidus phase equilibria, in particular for solubility limit of intermediate phase (e.g., MnV2O4 (s.s.)). Once the phase equlibria of the Mn-V-O system was obtained, a subsequent thermodynamic investigation for the MnV2O4 spinel phase was followed to measure the Gibbs energy of formation of the spinel phase employing chemical equilibration technique. The standard Gibbs free energy of formation of the MnV2O4 spinel phase was calculated from the equilibrium compositions of elements in liquid iron or liquid copper, and thermodynamic parameters available in the literatures. From the information obtained in the present study, a stability diagram of Fe-Mn-V-O system was constructed which can be used as an inclusion stability diagram.
phase equilibria Mn-V-O system spinel standard Gibbs free energy MnV2O4.
Min-Su Kim Youn-Bae Kang Hae-Geon Lee Woo-Yeol Cha
Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang, Rep. Steelmaking Research Group, Technical Research Laboratories, POSCO, Pohang, Rep. of Korea
国际会议
Ninth International Conference on Molten Slags,Fluxes and Salts(第九届国际熔渣、溶剂与熔盐学术会议 MOLTEN12)
北京
英文
1-13
2012-05-27（万方平台首次上网日期，不代表论文的发表时间）