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Synthesis of apatites, Na 1−x K x Pb 4 (PO 4 ) 3 0≤x≤1, with anion vacancy was carried out using solid state reactions. The solid solution of apatite-type structure crystallizes in the hexagonal system, space group P6 3 /m (No 176). Rietveld refinements showed that 75% of Pb 2+ cations are located in the (6h) sites; the ninefold coordination...
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