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Received: March 17, 2011; Revised: July 21, 2011The crystal structure of a synthetic AB-type carbonate apatite sample was analyzed by Rietveld refinement including a model with carbon atom not fixed in the B-site of the apatite structure. Only one constraint was applied to this model: the fractional occupancies of the atoms in the CO

A new possible atomic arrangement for the carbon atom in the B-sites of AB-type carbonate apatite