Structure and properties of calcium aluminosilicate glasses

Huang, Chengde; Behrman, Elizabeth

doi:10.1016/0022-3093(91)90468-l

Cited by 167 publications

(68 citation statements)

References 17 publications

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“…The medium intense band in the 600-400 cm -1 range generally represented bending vibration of T-O-T and T denotes Si, Al, or P elements. 23,26) As can be seen from Fig. 7, the band in the 600-400 cm -1 range slightly shifted successively to a lower wavenumber region with increasing P2O5 content at each basicity, which indicated a higher polymerization degree in another respect.…”

Section: Structure Analysismentioning

confidence: 78%

“…Amongst these vibration modes, the stretching vibration of SiO4 tetrahedral, AlO4 tetrahedral, PO4 groups, and TiO4, Ti2O6 groups have been reported in the relatively high wavenumber region, 23,[29][30][31][32][33][34] whereas the bending vibrations of T-O-T where T denotes Ti, Al, Si or P elements could appear in the lower wavenumber region (400-600 cm -1 range), as reported by some previous studies. 23,26,33) Raman spectra for slag melts are presented in Fig. 9.…”

Section: Structure Analysismentioning

confidence: 99%

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Effect of P2O5 Addition on the Viscosity and Structure of Titanium Bearing Blast Furnace Slags

et al. 2014

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This study provided a fundamental analysis of the viscosity and structure of titanium bearing blast furnace slags modified by different levels of P2O5 addition. The viscosity of slag melts was obtained by rotating cylinder method, which is a significant factor for blast furnace process and utilization of slags. The results showed that the slag viscosity was greatly influenced by basicity. Slag viscosity decreased and the calculated apparent activation energy for viscous flow also decreased with increasing basicity, which indicated the breakdown of melt structure. The addition of P2O5 substantially increased the slag viscosity at each basicity, and the increasing trend was most pronounced at basicity 0.5. To connect the viscosity changes of slags to the slag melt structure, Fourier transformation infrared (FTIR) and Raman spectral spectroscopy analysis were performed in this study. FTIR results clearly indicated that the added P2O5 increased the degree of polymerization of slags, corresponding to the increase of slag viscosity. Based on Raman and FTIR curves, it can be concluded that P2O5 acted as a characteristic network former in the melts.KEY WORDS: titanium bearing blast furnace slags; viscosity; P2O5; structure.

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Section: Structure Analysismentioning

confidence: 78%

Section: Structure Analysismentioning

confidence: 99%

Effect of P2O5 Addition on the Viscosity and Structure of Titanium Bearing Blast Furnace Slags

et al. 2014

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“…In past decades, the structure, properties and compositions of CaO-Al 2 O 3 -SiO 2 glass-ceramic have been studied theoretically and experimentally [1][2][3][4]. Electron paramagnetic resonance (EPR) technique yields information about the environmental symmetry and electric fields around paramagnetic ions doped to diamagnetic structures.…”

Section: Introductionmentioning

confidence: 99%

Investigations of the electron paramagnetic resonance spectra of VO2+ in CaO-Al2O3-SiO2 system

Wei

Zhang

et al. 2009

Pramana - J Phys

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The EPR spectra for VO 2+ in CaO-Al2O3-SiO2 system are calculated using complete diagonalization method (CDM) and perturbation theory method (PTM). The calculated results are in good agreement with the observed values. By comparing the calculated results by CDM and PTM in a wide range of crystal field parameters, the validity of the PTM formulas has been studied. It is shown that, the PTM formulas are reasonable and reliable in a wide range of CF parameters.

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“…In a detailed study on the FTIR spectra of calciumaluminate based oxide glasses, Huang and Behrman 7) showed pronounced Al-O tetrahedral stretching bands at wavenumbers near 800 cm -1 and the Al 3+ ions were found © 2012 ISIJ to be in four fold coordination at high basicities. In this study, the influence of Li2O on the viscous behavior of the slag system based on CaO-Al2O3-12 mass%Na2O-12 mass%CaF2 at a CaO/Al2O3 ratio of 0.8 was investigated using a rotating viscometer.…”

Section: Introductionmentioning

confidence: 99%

Influence of Li2O on the Viscous Behavior of CaO–Al2O3–12 mass% Na2O–12 mass% CaF2 Based Slags

Kim

Sohn

2012

ISIJ Int.

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The viscous behavior of the CaO-Al2O3-12 mass%Na2O-12 mass%CaF2 based slag system with various concentrations of Li2O has been studied using the rotating spindle method to understand the effects on the viscosity with these additives. Li2O additions up to 1 mass% significantly lowered the viscosity by breaking the [AlO4]-tetrahedral network structure of molten fluxes, but Li2O concentrations above this level was comparatively less effective in lowering the viscosity. The viscosity was lower at higher temperatures and from an Arrhenius relationship, the activation energy was calculated to be between approximately 180 to 190 kJ/mol. Fourier Transform Infra-Red (FTIR) analysis of as-quenched slag samples showed the characteristic Al-O stretching vibration in the wavenumber of 800 cm -1 and 660 cm -1 . Slags with higher viscosity showed a slightly wider trough near the 800 cm -1 and 660 cm -1 Al-O stretching bands. XPS analysis of slags with various concentrations of Li2O indicated the fraction of bridged oxygen (O o ) decreased and the non-bridged oxygen (O -) increased with higher concentrations of Li2O. Li2O additions up to 1 mass% significantly decreased the bridged oxygen fraction, which seem to correlate well with the viscosity measurements.

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Structure and properties of calcium aluminosilicate glasses

Cited by 167 publications

References 17 publications

Effect of P2O5 Addition on the Viscosity and Structure of Titanium Bearing Blast Furnace Slags

Effect of P2O5 Addition on the Viscosity and Structure of Titanium Bearing Blast Furnace Slags

Investigations of the electron paramagnetic resonance spectra of VO2+ in CaO-Al2O3-SiO2 system

Influence of Li2O on the Viscous Behavior of CaO–Al2O3–12 mass% Na2O–12 mass% CaF2 Based Slags

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