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

Joo Hyun Park, Dong Joon Min, Hyo Seok Song

Research output: Contribution to journalArticle

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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.

Original languageEnglish
Pages (from-to)38-43
Number of pages6
JournalISIJ International
Volume42
Issue number1
DOIs
Publication statusPublished - 2002 Jan 1

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Slags
Fourier transforms
Infrared radiation
Chemical analysis
Bond length
Depolymerization
Ions
Liquids

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

@article{b75ceb936e5447b4b7b6ae0a23e382ed,
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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Structural investigation of CaO-Al2O3 and CaO-Al2O3-CaF2 slags via Fourier transform infrared spectra. / Park, Joo Hyun; Min, Dong Joon; Song, Hyo Seok.

In: ISIJ International, Vol. 42, No. 1, 01.01.2002, p. 38-43.

Research output: Contribution to journalArticle

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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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