Apatite crystallization from glasses in the Ca-5(PO4)(3)F-CaAl2Si2O8-CaMgSi2O6-NaAlSi3O8 system
authors Fernandes, HR; Tulyaganov, DU; Ribeiro, MJ; Ferreira, JMF
nationality International
journal JOURNAL OF NON-CRYSTALLINE SOLIDS
author keywords Glass; Apatite; Microstructure; Phase separation; Crystallization
keywords CRYSTAL-GROWTH; CERAMICS; FLUOROAPATITE; GLAZES; LASER; K2O; NMR
abstract The aim of the present study is to investigate the apatite formation process from glasses in the fluorapatite-diopside-anorthite-albite system. The effects of partial and total replacement of anorthite fraction by albite in the ternary composition 26 Ca-5(PO4)(3)F-44 CaAl2Si2O8-30. CaMgSi2O6 (wt.%) on the properties of glasses and glass-ceramics were evaluated. The scanning electron microscopy (SEM) examination of glasses revealed the precipitation of a nanosize droplet phase in the glassy matrices suggesting the occurrence of amorphous phase separation in all annealed glasses. An overall trend towards polymerization of the glass network with increasing albite content was demonstrated by employing MAS-NMR and FTIR spectroscopy. X-ray diffraction (XRD) and differential thermal analysis (DTA) were used to assess the effect of albite content on the devitrification process and formation of fluorapatite crystalline phase (Ca-5(PO4)(3)F). (C) 2012 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0022-3093
year published 2013
volume 363
beginning page 32
ending page 38
digital object identifier (doi) 10.1016/j.jnoncrysol.2012.11.052
web of science category Materials Science, Ceramics; Materials Science, Multidisciplinary
subject category Materials Science
unique article identifier WOS:000315542400006
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