Investigation on phase separation and crystallization in Na2O-B2O3 glass system by nuclear-magnetic-resonance

Authors
Du, WF Kuraoka, K Akai, T Yazawa, T
Citation
Wf. Du et al., Investigation on phase separation and crystallization in Na2O-B2O3 glass system by nuclear-magnetic-resonance, J CERAM S J, 107(12), 1999, pp. 1151-1155
Citations number
20
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
JOURNAL OF THE CERAMIC SOCIETY OF JAPAN
ISSN journal
09145400 → ACNP
Volume
107
Issue
12
Year of publication
1999
Pages
1151 - 1155
Database
ISI
SICI code
0914-5400(199912)107:12<1151:IOPSAC>2.0.ZU;2-W
Abstract
The kinetics of phase separation in 15Na(2)O . 85B(2)O(3) binary glass was investigated using B-11 nuclear-magnetic-resonance (NMR) spectra together w ith X-ray diffraction (XRD) and scanning electron microscopy (SEM). The exp erimental results showed that the product of sodium-rich phase after heat-t reated at 500 degrees C was not Na2O . 4B(2)O(3) as suggested by previous p hase diagram. It was found that the high growth rate of boron-rich phase ca n force residual glass to much higher concentrations of sodium oxide. After reaching equilibrium, a 15Na(2)O . 85B(2)O(3) glass was separated into Na2 O . 9B(2)O(3) and 3Na(2)O . B2O3 according to NMR measurement.