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(a) Anionic sites interested in the carbonate ion substitutions in a single OHAp unit cell. It is worth noting that, due to P63 space group, the phosphate group are symmetrically equivalent. (b) Suggested configurations (“closed” and “open”) for the type-A carbonate ion. Colour coding for atoms: dark cyan–Ca; pink–PO43−; red–O; white–H.
