Volume 105, Issue 4 p. 2556-2574
RESEARCH ARTICLE

Structural dependence of crystallization in phosphorus-containing sodium aluminoborosilicate glasses

Ping Lu

Ping Lu

Department of Materials Science and Engineering, Rutgers, The State University of New Jersey, Piscataway, New Jersey, USA

School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, Hubei Province, China

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Saurabh Kapoor

Saurabh Kapoor

Center of Excellence, Sterlite Technologies, Aurangabad, India

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Libor Kobera

Libor Kobera

Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic

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Jiri Brus

Jiri Brus

Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic

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Ashutosh Goel

Corresponding Author

Ashutosh Goel

Department of Materials Science and Engineering, Rutgers, The State University of New Jersey, Piscataway, New Jersey, USA

Correspondence

Ashutosh Goel, Department of Materials Science and Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA; Phone: +1-848-445-4512.

Email: [email protected]

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First published: 22 November 2021
Citations: 5

Abstract

The article reports on the structural dependence of crystallization in Na2O–Al2O3–B2O3–P2O5–SiO2-based glasses over a broad compositional space. The structure of melt-quenched glasses has been investigated using 11B, 27Al, 29Si, and 31P magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy, while the crystallization behavior has been followed using X-ray diffraction and scanning electron microscopy combined with energy dispersive spectroscopy. In general, the integration of phosphate into the sodium aluminoborosilicate network is mainly accomplished via the formation of Al–O–P and B–O–P linkages with the possibility of formation of Si–O–P linkages playing only a minor role. In terms of crystallization, at low concentrations (≤5 mol.%), P2O5 promotes the crystallization of nepheline (NaAlSiO4), while at higher concentrations (≥10 mol.%), it tends to suppress (completely or incompletely depending on the glass chemistry) the crystallization in glasses. When correlating the structure of glasses with their crystallization behavior, the MAS NMR results highlight the importance of the substitution/replacement of Si–O–Al linkages by Al–O–P, Si–O–B, and B–O–P linkages in the suppression of nepheline crystallization in glasses. The results have been discussed in the context of (1) the problem of nepheline crystallization in Hanford high-level waste glasses and (2) designing vitreous waste forms for the immobilization of phosphate-rich dehalogenated Echem salt waste.