Abstract
Four new apatitic phases were prepared and their structures determined. The structure of Ca10(PO4)6S was refined from single crystal X-ray data and the structures of Sr10(PO4)6S, Ba10(PO4)6S and Ca10(PO4)6Se from powder X-ray data using the Rietveld method.The four apatites are isostructural and crystallize in the trigonal space group P-3 with the chalcogenide ion positioned at (0 0 ½). The sulfoapatites show no ability to absorb H2S in the way that oxyapatite absorbs H2O at elevated temperatures. This can be attributed to the position of the sulfide ion and the way it influences the crystal structure around the vacant chalcogenide position at (0 0 0).
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