Critical Evaluation and Thermodynamic Optimization of Calcium-magnesium-manganese-oxygen System

Download or read book Critical Evaluation and Thermodynamic Optimization of Calcium-magnesium-manganese-oxygen System written by Sourav Panda and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The prediction of thermodynamic properties and phase equilibria of an oxide system can plays an important role in the development and understanding of metal1urgical, ceramic and geological processes. The thermodynamic databases, developed by a critical evaluation and optimization of all existing thermodynamic properties and phase diagram, can help in understanding the reaction mechanism in various industrial processes more clearly and in developing new technology for various industries. As part of a large thermodynamic database development for steelmaking applications, all solid and liquid phases of Ca-Mg-Mn-O system were critically evaluated and optimized in the present study. The optimization of all systems in this study is self-consistent with thermodynamic principles. All the binary and ternary system have been critically evaluated and optimized based upon available phase-equilibrium and thermodynamic data. All thermodynamic models for each solutions used in this study were developed on the basis of their structure. In this way, the configurational entropy of solution can be taken into account properly in the Gibbs energy of solution. The molten oxide was modeled by the Modified Quasichemical Model, which takes into account short-range ordering of second-nearest-neighbor cations in the ionic melt. Extensive solid solutions such as spinel were modeled within the framework of the Compound Energy Formalism with consideration of their complex sublattice crystal structures. Other solid solutions such as monoxide were modeled using random mixing of ions on cation sites using a polynomial expansion of the excess Gibbs energy. All the thermodynamic calculations in the present study were carried out using FactSageTM thermodynamic software." --