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Nig. J. Basic Appl. Sci.. 2009; 17(2): 177-180


X-Ray Diffraction Studies on the Thermal Stability of Calcium-Strontium Hydroxyapatite Solid Solutions Syntheszed in the Presence of Diethylamine

I Abdullahi, SA Thomas.


Abstract

Calcium-Strontium hydroxyapatite (HAP) solid solutions in the presence and absence of diethylamine (DEA) were prepared by the method of co-precipitation from basic media. The samples were heated at 773.15K in a furnace. Characterization of the samples by x-ray powder diffractometry, atomic absorption spectroscopy (AAS) and UV- visible spectrometry revealed that calcium –strontium HAP solid solutions at an elevated temperature of 773.15K were unstable and underwent transformation into other phosphates possibly beta tricalcium phosphate(β-TCP). Solid solutions synthesized in the presence of DEA show remarkable stability and enhanced crystallinity at that temperature. The stability was probably due to the added organic molecule which acted as a template.

Key words: Apatites, solid solutions, templates.






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