title: Total attenuated reflection infrared analysis of silicon-stabilized tri-calcium phosphate.
abstract: Bioceramics based on silicon stabilized tricalcium phosphate [Si-TCP] have been investigated by attenuated total reflection infrared spectroscopy using an experimental preparation that ensures consistent high-quality spectral data. Phase normalized measurements show that changes in OH bands are primarily due to a decrease in the hydroxyapatite content; however, a band at 945 cm(-1) associated with dehydration of the apatite is visible and correlated with silicon doping. Changes in absorption bands with Si content associated with PO(4)(3-) differ for SiO(2) doping levels less than and greater than 0.2 mol of SiO(2)/mol of HA as the amount of Si-TCP phase saturates. Increased resolution allows the study of weak bands linked to Si at 668, 800, 863, and 892 cm(-1) and suggests that the loss of PO(4)(3-) coincides with the development of different silicate groups-SiO(4) at lower doping levels and a new silicon species at higher doping.
authors.affiliation: Departments of Physics and Chemistry, Queen's University, Kingston, Ontario, Canada K7L 3N6. derek.dunfield@gmail.ca
authors.forename: D
authors.initials: D
authors.lastname: Dunfield
authors.forename: M
authors.initials: M
authors.lastname: Sayer
authors.forename: H F
authors.initials: HF
authors.lastname: Shurvell
mesh_terms: D001031:Apatites / Q000737:chemistry; D002130:Calcium Phosphates / Q000737:chemistry*; D010316:Particle Size; D012825:Silicon / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D014961:X-Ray Diffraction
chemical_list: D001031:Apatites; D002130:Calcium Phosphates; C018392:tricalcium phosphate; D012825:Silicon