University of Oulu

Singh, H., Shu, Q., King, G., Liang, Z., Wang, Z., Cao, W., Huttula, M. and Fabritius, T. (2021), CaO–Al₂O₂–B₂O₂–BaO slags with varying mass ratio of BaO to CaO. J Am Ceram Soc, 104: 4505-4517.

Structure and viscosity of CaO–Al₂O₂–B₂O₂–BaO slags with varying mass ratio of BaO to CaO

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Author: Singh, Harishchandra1; Shu, Qifeng2,3; King, Graham4;
Organizations: 1Nano and Molecular Systems Research Unit, University of Oulu, Oulu, Finland
2Research Unit of Process Metallurgy, University of Oulu, Oulu, Finland
3School of Metallurgical and Ecological Engineering, University of Science and Technology, Beijing, China
4Canadian Light Source, Saskatoon, Saskatchewan, Canada
5School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang, Henan, China
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1 MB)
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Language: English
Published: John Wiley & Sons, 2021
Publish Date: 2021-10-21


The structure of CaO–Al₂O₃–B₂O₃–BaO glassy slags with varying mass ratio of BaO to CaO has been investigated by Raman spectroscopy, ¹¹B and ²⁷Al magic angle spinning nuclear magnetic resonance (MAS-NMR) spectroscopy and atomic pair distribution function (PDF). ¹¹B MAS-NMR spectra reveal the dominant coordination of boron as trigonal. Both simulations on ¹¹B MAS-NMR spectra and Raman spectroscopy indicate the presence of orthoborate as the primary borate group with a few borate groups with one bridging oxygen and minor four-coordinated boron sites. ²⁷Al MAS-NMR and PDF show the Al coordination as tetrahedral. Raman spectral study shows that the transverse vibration of AlIV–O–AlIV and AlIV–O–BIII, stretching vibration of aluminate structural units and vibration of orthoborate and pyroborate structural groups. A broader distribution of Al–O bond lengths in PDF also supports the enhanced network connectivity. Viscosity measurements show the increase in viscosity of molten slags with increasing mass ratio of BaO to CaO, which further attributes to the enhanced degree of polymerization of the aluminate network.

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Series: Journal of the American ceramic society
ISSN: 0002-7820
ISSN-E: 1551-2916
ISSN-L: 0002-7820
Volume: 104
Issue: 9
Pages: 4505 - 4517
DOI: 10.1111/jace.17877
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
216 Materials engineering
Funding: Authors acknowledge the financial support from Academy of Finland grant #311934. We also thank the Center of Microscopy and Nanotechnology, University of Oulu. The authors also acknowledge the financial support from National Natural Science Foundation of China (NSFC No. 51774026). Part of the research described in this paper was performed at the Canadian Light Source, a national research facility of the University of Saskatchewan, which is supported by the Canada Foundation for Innovation (CFI), the Natural Sciences and Engineering Research Council (NSERC), the National Research Council (NRC), the Canadian Institutes of Health Research (CIHR), the Government of Saskatchewan, and the University of Saskatchewan.
Copyright information: © 2021 The Authors. Journal of the American Ceramic Society published by Wiley Periodicals LLC on behalf of American Ceramic Society (ACERS). This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.