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Bulletin of the Chemical Society of Ethiopia

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Chemical and structural characterization of natural phosphate of Hahotoe (Togo)

Gado Tchangbeddji, Gnande Djeteli, Koffi Ani Kili, Jean Michel Savariault, Jean Louis Lacout

Abstract


 Chemical and structural characterizations of natural phosphates of Hahotoe (Togo) have been performed. From chemical analysis and FTIR study, it can be concluded that the material is carbonated fluoroapatite with poor substitution of calcium by cadmium and manganese. From these results, the molecular formula proposed is:

Ca9.925Cd0.004Mn0.013[(PO4)5.886(CO3)0.113]F2.

Powder X-ray diffraction fitting results confirm that compound belongs to the apatite family crystallising in the hexagonal system, space group P63/m. The cell parameters are: a = 9.3547(5) Å; c = 6.8929(4) Å.

 

KEY WORDS: Natural phosphate, Fluoroapatite, Infrared, X-Ray diffraction, Rietveld structure refinement

 

 

Bull. Chem. Soc. Ethiop. 2003, 17(2), 139-146.




http://dx.doi.org/10.4314/bcse.v17i2.61659
AJOL African Journals Online