Structural investigation of CaO-Al2O3 and CaO-Al2O3-CaF2 slags via Fourier transform infrared spectra

Joo Hyun Park; Dong Joon Min; Hyo Seok Song

doi:10.2355/isijinternational.42.38

Structural investigation of CaO-Al₂O₃ and CaO-Al₂O₃-CaF₂ slags via Fourier transform infrared spectra

Joo Hyun Park, Dong Joon Min, Hyo Seok Song

Department of Materials Science and Engineering

Research output: Contribution to journal › Article

59 Citations (Scopus)

Abstract

The FT-IR spectra of the CaO-Al₂O₃ and CaO-Al₂O₃-CaF₂ slags were measured to understand the structural aspects of (fluoro-) aluminate slags. The infrared spectra of the CaO-Al₂O₃ slag was interpreted based on the relationship between bond length and force constant of Al-O bond. Thereafter, the role of F^- ions in the depolymerization of aluminate network was discussed. The wavenumbers of [AlO₄]-tetrahedra higher than that of [AlO₆]-octahedra would be originated from the Al-O bond length in tetrahedra shorter than that in octahedra. In the CaO_satd-Al₂O₃-CaF₂ system, the IR-transmitting bands of [AlO_nF_4-n]-complexes are observed through the entire composition of the fluoroaluminate system, while the bands of [AlO₄]-tetrahedra, [AlO₆]-and [AIF₆]-octahedra appear in the composition less than 24.0(mol%) CaF₂. In the 26.2 (mol%) Al₂O₃-containing system, the bands of interlinked [AlO₄]-tetrahedra are shown at only 2-liquids boundary, while these bands are shown in the whole composition region in the 41.5 (mol%) Al₂O₃-containing system. In the 41.7 and 51.0(mol%)CaO-Al₂O₃-CaF₂ systems, the transmitting bands of [AlO_nF_4-n]-complexes are observed through the entire composition, while those of [AlO₄]-tetrahedra are shown in the composition of X_CaF(2)/X_Al(2)O(3) ≤ 1.0. Also, the relative intensity of the bands indicating [AlO₄]-tetrahedra in the 51.0 (mol%) CaO-containing slag is much less than that in the 41.7 (mol%) CaO-containing system.

Original language	English
Pages (from-to)	38-43
Number of pages	6
Journal	ISIJ International
Volume	42
Issue number	1
DOIs	https://doi.org/10.2355/isijinternational.42.38
Publication status	Published - 2002 Jan 1

All Science Journal Classification (ASJC) codes

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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Park, J. H., Min, D. J., & Song, H. S. (2002). Structural investigation of CaO-Al₂O₃ and CaO-Al₂O₃-CaF₂ slags via Fourier transform infrared spectra. ISIJ International, 42(1), 38-43. https://doi.org/10.2355/isijinternational.42.38

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title = "Structural investigation of CaO-Al2O3 and CaO-Al2O3-CaF2 slags via Fourier transform infrared spectra",

abstract = "The FT-IR spectra of the CaO-Al2O3 and CaO-Al2O3-CaF2 slags were measured to understand the structural aspects of (fluoro-) aluminate slags. The infrared spectra of the CaO-Al2O3 slag was interpreted based on the relationship between bond length and force constant of Al-O bond. Thereafter, the role of F- ions in the depolymerization of aluminate network was discussed. The wavenumbers of [AlO4]-tetrahedra higher than that of [AlO6]-octahedra would be originated from the Al-O bond length in tetrahedra shorter than that in octahedra. In the CaOsatd-Al2O3-CaF2 system, the IR-transmitting bands of [AlOnF4-n]-complexes are observed through the entire composition of the fluoroaluminate system, while the bands of [AlO4]-tetrahedra, [AlO6]-and [AIF6]-octahedra appear in the composition less than 24.0(mol%) CaF2. In the 26.2 (mol%) Al2O3-containing system, the bands of interlinked [AlO4]-tetrahedra are shown at only 2-liquids boundary, while these bands are shown in the whole composition region in the 41.5 (mol%) Al2O3-containing system. In the 41.7 and 51.0(mol%)CaO-Al2O3-CaF2 systems, the transmitting bands of [AlOnF4-n]-complexes are observed through the entire composition, while those of [AlO4]-tetrahedra are shown in the composition of XCaF(2)/XAl(2)O(3) ≤ 1.0. Also, the relative intensity of the bands indicating [AlO4]-tetrahedra in the 51.0 (mol%) CaO-containing slag is much less than that in the 41.7 (mol%) CaO-containing system.",

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N2 - The FT-IR spectra of the CaO-Al2O3 and CaO-Al2O3-CaF2 slags were measured to understand the structural aspects of (fluoro-) aluminate slags. The infrared spectra of the CaO-Al2O3 slag was interpreted based on the relationship between bond length and force constant of Al-O bond. Thereafter, the role of F- ions in the depolymerization of aluminate network was discussed. The wavenumbers of [AlO4]-tetrahedra higher than that of [AlO6]-octahedra would be originated from the Al-O bond length in tetrahedra shorter than that in octahedra. In the CaOsatd-Al2O3-CaF2 system, the IR-transmitting bands of [AlOnF4-n]-complexes are observed through the entire composition of the fluoroaluminate system, while the bands of [AlO4]-tetrahedra, [AlO6]-and [AIF6]-octahedra appear in the composition less than 24.0(mol%) CaF2. In the 26.2 (mol%) Al2O3-containing system, the bands of interlinked [AlO4]-tetrahedra are shown at only 2-liquids boundary, while these bands are shown in the whole composition region in the 41.5 (mol%) Al2O3-containing system. In the 41.7 and 51.0(mol%)CaO-Al2O3-CaF2 systems, the transmitting bands of [AlOnF4-n]-complexes are observed through the entire composition, while those of [AlO4]-tetrahedra are shown in the composition of XCaF(2)/XAl(2)O(3) ≤ 1.0. Also, the relative intensity of the bands indicating [AlO4]-tetrahedra in the 51.0 (mol%) CaO-containing slag is much less than that in the 41.7 (mol%) CaO-containing system.

AB - The FT-IR spectra of the CaO-Al2O3 and CaO-Al2O3-CaF2 slags were measured to understand the structural aspects of (fluoro-) aluminate slags. The infrared spectra of the CaO-Al2O3 slag was interpreted based on the relationship between bond length and force constant of Al-O bond. Thereafter, the role of F- ions in the depolymerization of aluminate network was discussed. The wavenumbers of [AlO4]-tetrahedra higher than that of [AlO6]-octahedra would be originated from the Al-O bond length in tetrahedra shorter than that in octahedra. In the CaOsatd-Al2O3-CaF2 system, the IR-transmitting bands of [AlOnF4-n]-complexes are observed through the entire composition of the fluoroaluminate system, while the bands of [AlO4]-tetrahedra, [AlO6]-and [AIF6]-octahedra appear in the composition less than 24.0(mol%) CaF2. In the 26.2 (mol%) Al2O3-containing system, the bands of interlinked [AlO4]-tetrahedra are shown at only 2-liquids boundary, while these bands are shown in the whole composition region in the 41.5 (mol%) Al2O3-containing system. In the 41.7 and 51.0(mol%)CaO-Al2O3-CaF2 systems, the transmitting bands of [AlOnF4-n]-complexes are observed through the entire composition, while those of [AlO4]-tetrahedra are shown in the composition of XCaF(2)/XAl(2)O(3) ≤ 1.0. Also, the relative intensity of the bands indicating [AlO4]-tetrahedra in the 51.0 (mol%) CaO-containing slag is much less than that in the 41.7 (mol%) CaO-containing system.

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