title: The influence of calcium to phosphate ratio on the nucleation and crystallization of apatite glass-ceramics.
abstract: The nucleation and crystallization behavior of a series of glasses based on 4.5SiO2-3Al2O3-YP2O5-3CaO-1.51CaF2 was studied. The parameter Y was varied to give calcium to phosphate ratios between one and two. All of the glasses studied crystallized firstly to fluorapatite (Ca5PO4)3F). The glass with a calcium to phosphate ratio of 1.67, corresponding to apatite, bulk nucleated to give fluorapatite (FAP). The glasses with calcium : phosphate ratios either less than that of apatite, or greater than that of apatite all exhibited surface nucleation of FAP. However, following a nucleation hold of one hour at approximately 50 K above the glass transition temperature these glasses exhibited bulk nucleation of FAP.
authors.affiliation: Department of Materials Science and Technology, University of Limerick, Limerick, Ireland.
authors.forename: A
authors.initials: A
authors.lastname: Clifford
authors.forename: R
authors.initials: R
authors.lastname: Hill
authors.forename: A
authors.initials: A
authors.lastname: Rafferty
authors.forename: P
authors.initials: P
authors.lastname: Mooney
authors.forename: D
authors.initials: D
authors.lastname: Wood
authors.forename: B
authors.initials: B
authors.lastname: Samuneva
authors.forename: S
authors.initials: S
authors.lastname: Matsuya