title: Synthesis and structural characterization of strontium- and magnesium-co-substituted beta-tricalcium phosphate.
abstract: The synthesis of five different Sr(2+)- and Mg(2+)-co-substituted beta-tricalcium phosphate (beta-TCP) has been obtained by heating the calcium-deficient apatites above 800 degrees C. With the investigated concentrations of Sr(2+) and Mg(2+) from the present study, no additional phases other than beta-TCP have been detected. The synthesized powders have been characterized by X-ray diffraction, Fourier transform infrared spectrometry, elemental analysis and Rietveld refinement studies. The co-substitution of Sr(2+) and Mg(2+) in the beta-TCP has resulted in the formation of crystalline beta-TCP at hexagonal setting (space group R3c). The reduction of lattice a- and c-axis parameters with the combined substitution of Sr(2+) and Mg(2+) in the beta-TCP has been found evident from the present results. Sr(2+) has been found occupying the Ca(1,2,3,4) sites and Mg(2+) was found at the sixfold coordinated Ca(5) site of beta-TCP structure.
authors.affiliation: Department of Ceramics and Glass Engineering, CICECO, University of Aveiro, Aveiro, Portugal.
authors.forename: S
authors.initials: S
authors.lastname: Kannan
authors.forename: F
authors.initials: F
authors.lastname: Goetz-Neunhoeffer
authors.forename: J
authors.initials: J
authors.lastname: Neubauer
authors.forename: S
authors.initials: S
authors.lastname: Pina
authors.forename: P M C
authors.initials: PM
authors.lastname: Torres
authors.forename: J M F
authors.initials: JM
authors.lastname: Ferreira
mesh_terms: D002130:Calcium Phosphates / Q000138:chemical synthesis* / Q000737:chemistry; D008274:Magnesium / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013324:Strontium / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D002130:Calcium Phosphates; C485817:beta-tricalcium phosphate; D008274:Magnesium; D013324:Strontium