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Synthesis and settings behavior of α-TCP from calcium deficient hyroxyapatite obtained by hydrothermal method

B. JOKIC1,* , I. JANKOVIC-CASTVAN1, DJ. VELJOVIC1, D. BUCEVAC2, K. OBRADOVIC-DJURICIC3, R. PETROVIC1, DJ. JANACKOVIC1

Affiliation

  1. Faculty of Technology and Metallurgy, Karnegijeva 4, 11000 Belgrade, Serbia
  2. Institute for Nuclear Science, Vinca, Belgrade, Serbia
  3. Faculty of Stomatology, Belgrade, Serbia

Abstract

The aim of this work is the investigation of alpha-tricalcium-phosphate (α-TCP) formation from calcium-deficient hydroxyapatite (CDHAP), synthesized by hydrothermal method from CaCl2, EDTA, NaH2PO4·2H2O and urea as precursors at 160 oC. Further, the influence of Ca/P ratios in the starting solution on α-TCP formation and the settings of obtained cements in simulated body fluid (SBF) were investigated. According to the results of X-ray, FTIR and SEM analyses, it is shown that CDHAP is transformed to β-TCP at 800 oC, and to α-TCP at 1200 oC. Almost complete transformation of CDHAP into α-TCP occur after heating at 1500 oC in the case when Ca/P ratio in starting solution was 1,42. Cement powder mixed with the cement liquid (2.5 wt.% solution of Na2HPO4) completely hydrolyzes after 7 days in SBF, forming only CDHAP phase..

Keywords

α-TCP Cements, Synthesis, Calcium Deficient Hydroxyapatite.

Submitted at: March 23, 2007
Accepted at: June 15, 2007

Citation

B. JOKIC, I. JANKOVIC-CASTVAN, DJ. VELJOVIC, D. BUCEVAC, K. OBRADOVIC-DJURICIC, R. PETROVIC, DJ. JANACKOVIC, Synthesis and settings behavior of α-TCP from calcium deficient hyroxyapatite obtained by hydrothermal method, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 6, pp. 1904-1910 (2007)