Lim, S; Baikie, Tom; Pramana, Stevin S; Smith, Ron; White, Timothy
[AI]4[AII]6(BO4)6X2 apatites can flexibly accommodate numerous cationic, metalloid and anionic substitutions. Using a combination of new refinements and published structures, this paper reviews correlations between substituent type and framework adaptation through adjustment of the AIO6 metaprism twist angle, φ. These systematics are illustrated through powder neutron diffraction refinement of the crystal chemistry of A10(PO4)6F2 (A=Ca, Sr) fluorapatites. Variations in φ reflect changes in the...[Show more]
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