Effect of substituting CaO with BaO on the viscosity and structure of CaO-BaO-SiO2-MgO-Al2O3 slags

Zhanjun Wang, Il Sohn

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

In this study, the effect of CaO and BaO substitution on the viscosity and structure of CaO-BaO-SiO2-MgO-Al2O3 slags was investigated. The results showed that the viscosity increased with an increase in the BaO substitution concentration, which was correlated to an increase in the degree of polymerization (DOP) of the slag structural units as the activation energy increased from 207.9 to 263.8 kJ/mol for viscous flow. Deconvolution and area integration of the Raman spectrum of the slag revealed that the ratio of Q3/Q2 (Qi, i is the number of O0 in a [SiO4]-tetrahedral unit) increased and NBO/Si (nonbridging oxygen per unit silicon atom) decreased with higher BaO content. It was also observed from the 27Al magic angles pinning nuclear magnetic resonance (27Al MAS-NMR) spectrum that the relative proportion of AlIV increased, while that of AlV decreased because of the decrease in the percentage of nonbridging oxygen (O), indicating the polymerization of the slag. O1s X-ray photoelectron spectroscopy (XPS) was also carried out to semi-quantitatively analyze the various types of oxygen anions present in the slag. The XPS results correlated well with the results obtained from the analysis of the Raman and 27Al MAS-NMR spectra of the slags and its viscous behavior.

Original languageEnglish
Pages (from-to)4285-4296
Number of pages12
JournalJournal of the American Ceramic Society
Volume101
Issue number9
DOIs
Publication statusPublished - 2018 Sep 1

Fingerprint

slag
Slags
viscosity
Viscosity
Oxygen
polymerization
oxygen
X-ray spectroscopy
nuclear magnetic resonance
substitution
Substitution reactions
X ray photoelectron spectroscopy
Polymerization
Nuclear magnetic resonance
viscous flow
Deconvolution
Silicon
Viscous flow
deconvolution
activation energy

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Geology
  • Geochemistry and Petrology
  • Materials Chemistry

Cite this

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title = "Effect of substituting CaO with BaO on the viscosity and structure of CaO-BaO-SiO2-MgO-Al2O3 slags",
abstract = "In this study, the effect of CaO and BaO substitution on the viscosity and structure of CaO-BaO-SiO2-MgO-Al2O3 slags was investigated. The results showed that the viscosity increased with an increase in the BaO substitution concentration, which was correlated to an increase in the degree of polymerization (DOP) of the slag structural units as the activation energy increased from 207.9 to 263.8 kJ/mol for viscous flow. Deconvolution and area integration of the Raman spectrum of the slag revealed that the ratio of Q3/Q2 (Qi, i is the number of O0 in a [SiO4]-tetrahedral unit) increased and NBO/Si (nonbridging oxygen per unit silicon atom) decreased with higher BaO content. It was also observed from the 27Al magic angles pinning nuclear magnetic resonance (27Al MAS-NMR) spectrum that the relative proportion of AlIV increased, while that of AlV decreased because of the decrease in the percentage of nonbridging oxygen (O−), indicating the polymerization of the slag. O1s X-ray photoelectron spectroscopy (XPS) was also carried out to semi-quantitatively analyze the various types of oxygen anions present in the slag. The XPS results correlated well with the results obtained from the analysis of the Raman and 27Al MAS-NMR spectra of the slags and its viscous behavior.",
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Effect of substituting CaO with BaO on the viscosity and structure of CaO-BaO-SiO2-MgO-Al2O3 slags. / Wang, Zhanjun; Sohn, Il.

In: Journal of the American Ceramic Society, Vol. 101, No. 9, 01.09.2018, p. 4285-4296.

Research output: Contribution to journalArticle

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