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
José Maria da Fonte Ferreira
Professor(a) Jubilado(a)
Paula Maria da Costa Torres
Investigador Auxiliaragradecimentos
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.