Number of the records: 1
Structural dependence of crystallization in phosphorus-containing sodium aluminoborosilicate glasses
- 1.
SYSNO ASEP 0552884 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Structural dependence of crystallization in phosphorus-containing sodium aluminoborosilicate glasses Author(s) Lu, P. (US)
Kapoor, S. (IN)
Kobera, Libor (UMCH-V) RID, ORCID
Brus, Jiří (UMCH-V) RID, ORCID
Goel, A. (US)Source Title Journal of the American Ceramic Society. - : Wiley - ISSN 0002-7820
Roč. 105, č. 4 (2022), s. 2556-2574Number of pages 19 s. Language eng - English Country US - United States Keywords crystals/crystallization ; glass ; glass-ceramics Subject RIV CD - Macromolecular Chemistry OECD category Polymer science Method of publishing Limited access Institutional support UMCH-V - RVO:61389013 UT WOS 000728412500001 EID SCOPUS 85120828069 DOI 10.1111/jace.18256 Annotation 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. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2023 Electronic address https://ceramics.onlinelibrary.wiley.com/doi/10.1111/jace.18256
Number of the records: 1