The influence of calcium to phosphate ratio on the nucleation and crystallization of apatite glass-ceramics

Citation
A. Clifford et al., The influence of calcium to phosphate ratio on the nucleation and crystallization of apatite glass-ceramics, J MAT S-M M, 12(5), 2001, pp. 461-469
Citations number
36
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Multidisciplinary
Journal title
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE
ISSN journal
0957-4530 → ACNP
Volume
12
Issue
5
Year of publication
2001
Pages
461 - 469
Database
ISI
SICI code
0957-4530(2001)12:5<461:TIOCTP>2.0.ZU;2-Y
Abstract
The nucleation and crystallization behavior of a series of glasses based on 4.5SiO(2)- 3Al(2)O(3)-YP2O5-3CaO-1.51CaF(2) was studied. The parameter Y w as varied to give calcium to phosphate ratios between one and two. All of t he glasses studied crystallized firstly to fluorapatite (Ca-5(PO4)(3)F). Th e glass with a calcium to phosphate ratio of 1.67, corresponding to apatite , bulk nucleated to give fluorapatite (FAP). The glasses with calcium : pho sphate ratios either less than that of apatite, or greater than that of apa tite all exhibited surface nucleation of FAP. However, following a nucleati on hold of one hour at approximately 50 K above the glass transition temper ature these glasses exhibited bulk nucleation of FAP. (C) 2001 Kluwer Acade mic Publishers.