Abstract
The possible mechanism originating the stretching and librational bands of the OH groups in ir spectra of various apatites are discussed. On the basis of relating the ν s frequency of the V 3 hindered potential barrier, it is deduced that hydrogen bonds between the OH groups and the nearest O's of PO 3− 4 ions exist, and that they are responsible for the observed frequencies of the stretching and librational modes. The additional ir OH bands of heated nonstoichiometric hydroxylapatites are also discussed.
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