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The study of Mg2+ /Ca2+ substitution of -tricalcium phosphate

C. TARDEI1,* , F. GRIGORE1, I. PASUK1, S. STOLERIU2

Affiliation

  1. National Institute for electrical Engineering ICPE-CA, 313 Splaiul Unirii, Bucharest, Romania
  2. University „Politehnica” of Bucharest, 313 Splaiul Independentei, 77206 Bucharest, Romania

Abstract

This study aimed to investigate the formation and properties of magnesium substituted tricalcium phosphate containing various amounts of Mg2+ and Ca2+ ions (-TCMP), isostructural with - Mg2+ ions (-Ca3 (PO4)2. Beta-TCP and -TCMP were prepared by a solid-state reaction, then calcination at 900ºC for 2hr, and fina ly sintered at 1100ºC for 2hr. The incorporation of Mg was reflected in the shift in the x-ray diffraction peaks due to partial Mg-for-Ca substitution in tricalcium phosphate, causing a contraction in the unit ce l dimension. Unit cell parameters ao and co, and molar volume Vo decrease linearly for atomic ratios Mg2+/ Mg2++Ca2+ varying from 0 to 10 mol%. The morphology and chemical composition were analyzed semiquantitatively using X-ray diffraction analysis (XRD), thermogravimetric analysis (TGA), differential thermal analysis (DTA), scanning electron microscopy (SEM) and infrared spectroscopy (IR). The dissolution behaviour of Mg-substituted samples was tested in distilled water, at pH=6.1. Results demonstrated that Mg2+ ions can easily substitute for Ca2+ ions in the TCP lattice. Increasing the Mg content from 0 to 10%m reduces the dissolution rate of Mg-TCP samples..

Keywords

Beta-tricalcium phosphate, Ceramic, Mg-substitution, Biodegradation.

Submitted at: Jan. 18, 2006
Accepted at: March 23, 2006

Citation

C. TARDEI, F. GRIGORE, I. PASUK, S. STOLERIU, The study of Mg2+ /Ca2+ substitution of -tricalcium phosphate, Journal of Optoelectronics and Advanced Materials Vol. 8, Iss. 2, pp. 568-571 (2006)