resumo
The synthesis of five different Sr(2+) and Mg(2+)-co-substituted p-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. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
palavras-chave
MECHANICAL PERFORMANCE; STABILIZING IMPURITY; THERMAL-STABILITY; DEFICIENT APATITE; BONE-FORMATION; MG; BETA-CA3(PO4)2; TEMPERATURE; REFINEMENT; SODIUM
categoria
Engineering; Materials Science
autores
Kannan, S; Goetz-Neunhoeffer, F; Neubauer, J; Pina, S; Torres, PMC; Ferreira, JMF
nossos autores
agradecimentos
Thanks are due to the Portuguese Foundation for Science and Technology for the financial support from the project POCTI/CTM/60207/2004 and for the fellowship grants of S. Karman (SFRH/BPD/18737/2004) and S. Pina (SFRH/BD/21761/2005). The authors gratefully acknowledge financial support from GRICESDAAD. They thank Kerstin Kress and Daniele Lutz for performing the ICP analysis.