NMR-STUDY OF CRYSTALLIZATION IN MGO-CAO-SIO2-P2O5 GLASS-CERAMICS

Citation
Hl. Ren et al., NMR-STUDY OF CRYSTALLIZATION IN MGO-CAO-SIO2-P2O5 GLASS-CERAMICS, Chemical physics letters, 292(3), 1998, pp. 317-322
Citations number
10
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics, Atomic, Molecular & Chemical
Journal title
ISSN journal
0009-2614
Volume
292
Issue
3
Year of publication
1998
Pages
317 - 322
Database
ISI
SICI code
0009-2614(1998)292:3<317:NOCIMG>2.0.ZU;2-X
Abstract
Si-29 and P-31 magic-angle-spinning (MAS) nuclear magnetic resonance ( NMR) measurements were employed to investigate crystallization in MgO- CaO-SiO2-P2O5 bioglass-ceramics. The results suggest that wollastonite (beta-CaSiO3) is separated as a new crystalline phase, corresponding to the appearance of a sharp signal in the Si-29 MAS NMR spectra, whil e oxyapatite (Ca-10(PO4)(6)O) forms in the process of the order of the phosphorus-rich phases increasing as a whole, corresponding to the gr adual narrowing of P-31 MAS NMR spectra. ZnO can make the glass stable and difficult to crystallize at a low temperature, while at a high te mperature, ZnO can participate in the crystallization of beta-CaSiO3 a nd promote it. (C) 1998 Elsevier Science B.V. All rights reserved.