Aqueous precipitation method for the formation of Mg-stabilized beta-tricalcium phosphate: An X-ray diffraction study

resumo

The preparation of magnesium (Mg)-stabilized beta-tricalcium phosphate [beta-TCP, beta-Ca-3(PO4)(2)] was carried out by an aqueous precipitation method and the characterization was performed by powder X-ray diffraction. The transformation of calcium-deficient apatite (def-apatite) into beta-TCP occurred in the range of 600-700 degrees C in the case of Mg substitution, whereas in the absence of Mg the transformation took place at higher temperatures (700-800 degrees C). The thermal stability of Mg-stabilized beta-TCP powders was observed until 1400 degrees C resulting in higher density values when compared to that of pure beta-TCP, which indicated thermal stability only till 1100 degrees C and comparably lower density values. Addition of Mg to the precursors Ca/P molar ratio = 1.5 resulted in the formation of small amounts of hydroxyapatite [HAP, Ca-10(PO4)(6)(OH)(2)]. The calculated values for lattice parameters confirm the stabilization role played by Mg. (c) 2006 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

palavras-chave

SUBSTITUTED HYDROXYAPATITE; TRANSFORMATION; DISSOLUTION; CERAMICS; BEHAVIOR; APATITE; TCP

categoria

Materials Science

autores

Kannan, S; Ventura, JM; Ferreira, JMF

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