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Hydroxyapatites were synthesized by precipitation from an aqueous solution with La 3+ (0–0.75%) and with carbonate (0–6.1%) at controlled pH 7.0. Uptake of La 3+ was 90–95% complete. Relatively low Ca/P (1.54–1.63) ratios were attributed to nonstoichiometry. Carbonate in samples was identified by IR spectroscopy as B-type carbonate. Lattice parameters of the hexagonal apatite structure...
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