title: Heterogeneous fluoridated hydroxyapatites partially substituted with fluoride ions.
abstract: The partially substituted fluoridated apatites H-FHAp0.5 and FH-HAp0.5 were synthesized heterngeneously by supplying fluoride at a concentration equivalent to half of the maximum value of fluorapatite during the initial or final half of the experimental period. Although X-ray diffraction patterns and SEM photos of H-FHAp0.5 and FH-HAp0.5 apatites were not significantly different, high-resolution electron microscopy showed quite different features; H-FHAp0.5 type apatite was an elongated hexagon with electron beam damage in the core, and FH-HAp0.5 type apatite was a rather wide hexagon analogous to fluorapatite. Energy dispersive spectroscopy attached to the SEM showed H-FHAp0.5 apatite to have a higher fluoride peak intensity than FH-HAp0.5. These results supported the previous speculations on the two different types of heterogeneous fluoridated hydroxyapatites: hydroxyapatite covered with fluorapatite and fluorapatite coverted with hydroxyapatite.
authors.affiliation: Department of Dental Materials Science and Technology, Osaka University Faculty of Dentistry, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Okazaki
authors.forename: M
authors.initials: M
authors.lastname: Taira
authors.forename: J
authors.initials: J
authors.lastname: Takahashi
authors.forename: H
authors.initials: H
authors.lastname: Tohda
authors.forename: T
authors.initials: T
authors.lastname: Yanagisawa
mesh_terms: D003460:Crystallization; D005459:Fluorides / Q000737:chemistry*; D006882:Hydroxyapatites / Q000138:chemical synthesis / Q000737:chemistry*; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D014961:X-Ray Diffraction
chemical_list: D006882:Hydroxyapatites; D005459:Fluorides