Thermodynamics of iron redox equilibria and viscosity-structure relationship of CaO-Al2O3-FetO melts
- Title
- Thermodynamics of iron redox equilibria and viscosity-structure relationship of CaO-Al2O3-FetO melts
- Author
- 박주현
- Keywords
- Calcium aluminate; Iron oxide; Redox equilibria; Raman spectroscopy; Viscosity; Slag
- Issue Date
- 2020-07
- Publisher
- ELSEVIER
- Citation
- JOURNAL OF NON-CRYSTALLINE SOLIDS, v. 542, Article no. 120089, 9pp
- Abstract
- The effects of composition on the iron redox equilibria and structural changes in the CaO-Al2O3-FetO melts have been investigated at 1823 K. The ferric to ferrous (Fe3+/Fe2+) ratio increases with increasing basicity and total iron oxide content when the activity of CaO (a(CaO)) is greater than 0.3. However, the Fe3+/Fe2+ ratios decrease with increasing iron oxide content in the case of the existence of octahedrally coordinated Fe3+ ions in a(CaO) = 0.2 composition range. From Raman spectroscopic analysis, it was observed that the addition of iron oxide (up to 10 wt% T.Fe) to calcium aluminate melts modifies the aluminate networks. Furthermore, the non-bridging oxygen per tetrahedron (NBO/T) ratio in the CaO-Al2O3-FetO melts increases with increasing content of iron oxide because the [FeO4]-tetrahedron ferrite networks substitutes for the [AlO4]-tetrahedron aluminate networks. The activation energy for the viscous flow of the CaO-Al2O3-FetO melts has a good linear relationship with the relative concentration of polymerized [AlO4] unit, i.e., ln Q(Al)(4).
- URI
- https://www.sciencedirect.com/science/article/pii/S0022309320302064https://repository.hanyang.ac.kr/handle/20.500.11754/164882
- ISSN
- 0022-3093; 1873-4812
- DOI
- 10.1016/j.jnoncrysol.2020.120089
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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