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Abstract
Fluorapatite, chlorapatite and a mixed apatite synthesised by a high temperature solid state reaction route were analysed using time-of-flight neutron diffraction of the series Ca 5(PO 4) 3F 1 − x Cl x , where x = 0.0, 0.5 and 1.0. Fluorapatite and the mixed apatite were found to be hexagonal in crystal structure. The chlorapatite was monoclinic in structure. The lattice parameters a and b increased with chlorine addition while c decreased. The unit cell volume increased linearly with chlorine content and the density decreased. The Ca(1)O 6 metaprism twist angle ( φ) decreased with chlorine addition indicating a tendency towards ideal hcp packing.
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