Počet záznamů: 1
Structural dependence of crystallization in phosphorus-containing sodium aluminoborosilicate glasses
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SYSNO ASEP 0552884 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Structural dependence of crystallization in phosphorus-containing sodium aluminoborosilicate glasses Tvůrce(i) Lu, P. (US)
Kapoor, S. (IN)
Kobera, Libor (UMCH-V) RID, ORCID
Brus, Jiří (UMCH-V) RID, ORCID
Goel, A. (US)Zdroj.dok. Journal of the American Ceramic Society. - : Wiley - ISSN 0002-7820
Roč. 105, č. 4 (2022), s. 2556-2574Poč.str. 19 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova crystals/crystallization ; glass ; glass-ceramics Vědní obor RIV CD - Makromolekulární chemie Obor OECD Polymer science Způsob publikování Omezený přístup Institucionální podpora UMCH-V - RVO:61389013 UT WOS 000728412500001 EID SCOPUS 85120828069 DOI 10.1111/jace.18256 Anotace 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. Pracoviště Ústav makromolekulární chemie Kontakt Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Rok sběru 2023 Elektronická adresa https://ceramics.onlinelibrary.wiley.com/doi/10.1111/jace.18256
Počet záznamů: 1