Speaker
Dr
Reiko Murao
(Nippon Steel & Sumitomo Metal Corporation)
Description
It is important to understand solid–liquid equilibrium of Al2O3-CaO-Fe2O3-SiO2 system to understand the sintering reaction, although the sintering reaction is a non-equilibrium and inhomogeneous. Phase equilibrium calculation of this system has some problems, such as thermodynamic models for some silico-ferrite of aluminum and calcium phases were not present.
Thermodynamic modeling of SFCA, Ca2(Fe,Ca,Al)6(Fe,Al,Si)6O20 was conducted in the framework of the Compound Energy Formalism (CEF). Preferred substitution of Al in tetrahedral cite was observed by Fe and Al *K*-edge X-ray absorption near edge structure. On considering crystallographic information in particular the charge compensation relation in the SFCA solution, the Ca8(Fe3+)20*Oct*(CaSi6+,FeFe6+,FeAl6+)3*paired*(CaSi6+)1*paired*(Fe3+,Al3+)20*Tet*O80 structure was considered as the SFCA solution model. By using this new model, SFCA single phase region can be well described in the phase diagram of the Ca4Si3O10–CaFe6O10–CaAl6O10 system.
Thermodynamic modeling of SFCA, Ca2(Fe,Ca,Al)6(Fe,Al,Si)6O20 was conducted in the framework of the Compound Energy Formalism (CEF). Preferred substitution of Al in tetrahedral cite was observed by Fe and Al *K*-edge X-ray absorption near edge structure. On considering crystallographic information in particular the charge compensation relation in the SFCA solution, the Ca8(Fe3+)20*Oct*(CaSi6+,FeFe6+,FeAl6+)3*paired*(CaSi6+)1*paired*(Fe3+,Al3+)20*Tet*O80 structure was considered as the SFCA solution model. By using this new model, SFCA single phase region can be well described in the phase diagram of the Ca4Si3O10–CaFe6O10–CaAl6O10 system.
Author
Dr
Reiko Murao
(Nippon Steel & Sumitomo Metal Corporation)
Co-authors
Prof.
In-Ho Jung
(Seoul National University)
Prof.
Masao Kimura
(High Energy Accelerator Research Organization)
Mr
Takayuki Harano
(Nippon Steel & Sumitomo Metal Corporation)