Structural Understanding of MnO-SiO2-Al2O3-Ce2O3 Slag via Raman, Al-27 NMR and X-ray Photoelectron Spectroscopies
- Authors
- Kim, Tae Sung; Jeong, Se Ji; Park, Joo Hyun
- Issue Date
- Oct-2019
- Publisher
- 대한금속·재료학회
- Keywords
- Raman spectroscopy; Al-27 NMR spectroscopy; X-ray photoelectron spectroscopy; MnO-SiO2-Al2O3-Ce2O3 slag or inclusion; Octahedron; Tetrahedron
- Citation
- Metals and Materials International, v.26, no.12, pp 1872 - 1880
- Pages
- 9
- Indexed
- SCI
SCIE
SCOPUS
KCI
- Journal Title
- Metals and Materials International
- Volume
- 26
- Number
- 12
- Start Page
- 1872
- End Page
- 1880
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/687
- DOI
- 10.1007/s12540-019-00474-1
- ISSN
- 1598-9623
2005-4149
- Abstract
- In order to understand sulfur solubility in the MnO-SiO2-Al2O3-Ce2O3 slag or inclusion system (mol MnO/mol SiO2=M/S=2.2 or 0.9, Al2O3=14.2[1.8] mol%, Ce2O3=0-5.6 mol%), the effect of Ce3+ ions on the structure of the Mn-aluminosilicate system with different M/S molar ratios has been studied by micro-Raman spectroscopy, solid-state nuclear magnetic resonance (NMR) spectroscopy and X-ray photoelectron spectroscopy (XPS). Because constant oxygen partial pressure was maintained at p(O-2)=2.8x10(-7) atm, oxidation state of Mn and Ce would be in Mn2+ and Ce3+ in the MnO-SiO2-Al2O3-Ce2O3 system, which were also confirmed by XPS analysis. Although it was difficult to measure the Al-27 solid-state NMR spectra of the quenched MnO-SiO2-Al2O3 system due to the paramagnetic effect, Al-27 NMR spectra did show structural changes in aluminate when cerium was added to the Mn-aluminosilicate melts. Addition of Ce2O3 in the high M/S(=2.2) system caused both an explosive enhancement in the intensity of Raman bands at 600 cm(-1) and a peak shift in Al-27 NMR spectra, indicating the transition from the [AlO4](-):0.5Mn(2+) tetrahedron to a [AlO6](3-):Ce3+ octahedron complex due to a strong attraction between aluminate and the cerium ion. XPS spectra show that the transition of the aluminate structure upon introduction of Ce3+ ions consumes free oxygen in Mn-aluminosilicate melts in high M/S(=2.2) system. However, the same structural changes were not observed when Ce2O3 was added to lower M/S(=0.9) system, because Ce3+ ions primarily interact with the pre-existing [AlO6]-octahedron in low M/S system.
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