The role of ammonium citrate washing on the characteristics of mechanochemical--hydrothermal derived magnesium-containing apatites

Chen, Chun-Wei and Suchanek, Wojciech L. and Shuk, Pavel and Byrappa, K. and Oakes, Charles and Riman, Richard E. and Brown, Kelly and TenHuisen, Kevor S. and Janas, Victor F. (2007) The role of ammonium citrate washing on the characteristics of mechanochemical--hydrothermal derived magnesium-containing apatites. Journal of Materials Science: Materials in Medicine, 18 (7). pp. 1413-1421. ISSN 1573-4838

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Abstract

The role of citrate washing on the physical and chemical characteristics of magnesium-substituted apatites (HAMgs) was performed. HAMgs were synthesized by a mechanochemical--hydrothermal route at room temperature in as little as 1 h, which is five times faster than our previous work. Magnesium-substituted apatites had concentrations as high as 17.6 wt% Mg with a corresponding specific surface area (SSA) of 216 m2/g. A systematic study was performed to examine the influence of increasing magnesium content on the physical and chemical characteristics of the reaction products. As the magnesium content increased from 0 to 17.6 wt%, magnesium-doped apatite crystallite size decreased from 12 to 8.8 nm. The Mg/(Mg + Ca) ratio in the product was enriched relative to that used for the reacting precursor solution. During mechanochemical--hydrothermal reaction, magnesium doped apatites co-crystallize with magnesium hydroxide. Citrate washing serves to remove the magnesium hydroxide phase. The concomitant increase in surface area results because of the removal of this phase. Possible mechanisms for magnesium hydroxide leaching are discussed to explain the measured trends.

Item Type:	Article
Subjects:	F Earth Science > Geology
Divisions:	Department of > Earth Science
Depositing User:	C Swapna Library Assistant
Date Deposited:	13 Sep 2019 10:29
Last Modified:	13 Sep 2019 10:29
URI:	http://eprints.uni-mysore.ac.in/id/eprint/8131

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