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Figure 1
(a) The chains of the M1O9 polyhedra in HAp running parallel to the c axis with neighbouring PO4 coordination tetrahedra as viewed along [010]. (b) The crystal structure of HAp viewed along [001]. The largest dark spheres represent M1 sites. M2 positions are connected in triangles around the anion, i.e. OH− group in the channel. PO4 coordination tetrahedra are shaded.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 43| Part 2| February 2010| Pages 320-327
doi:10.1107/S0021889809051395
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