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P.A. Henning, E. Adolfsson, J. Grins

The chalcogenide phosphate apatites Ca₁₀(PO₄)₆S, Sr₁₀(PO₄)₆S, Ba₁₀(PO₄)₆S and Ca₁₀(PO₄)₆Se

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).

Zeitschrift für Kristallographie, Oldenbourg Wissenschaftsverlag

Print ISSN: 0044-2968
Volume: 215, 04/2000
Pages: 226

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