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A continuous series of solid solutions in the system of strontium and lead hydroxyapatite, Pb x Sr 1 x HAP x 0-1 , was successfully synthesized by low-temperature mixing method LTMM at 160? C for 12 h under hydrothermal conditions. The samples were characterized by chemical analysis, electron microscopic observation and X-ray powder-pattern fitting. The site of the metal ions in the solid solutions was analyzed by the Rietveld method. The lattice constants of the prepared solid solutions varied linearly with Pb contents. It was found that Pb 2 ions in the solid solutions preferentially occupied the M 2 site in the apatite structure.

Abstract:The solid solutions in the system of Pb and Sr hydroxyapatite, Sr 10-x Pb x HAp (x= 0-10), were successfully synthesized by high-temperature mixing method (HTMM) at 160ºC for 12 hours under hydrothermal conditions. The samples were characterized by X-ray diffraction, chemical analysis and electron microscopic observation, and the site of the metal ions in the solid solutions was analyzed with the Rietveld method.The lattice constants, both a and c, of the solid solutions varied linearly with Pb content. It was found that Pb ions in the solid solutions preferentially occupied the M (2) site in the apatite structure. HTMM gives Sr-Pb HAp solid solutions much better crystallization. However, due to the formation of intermediate compound of

Abstract:The solid solutions in the system of Ca and Pb hydroxyapatite, Ca 10-χ Pb χ HA (χ= 0-10), were successfully synthesized by high-temperature mixing method (HTMM) at 200ºC for 12 hours under hydrothermal conditions. The samples were characterized by X-ray diffraction, chemical analysis and electron microscopic observation, and the site of the metal ions in the solid solutions was analyzed with the Rietveld method.The lattice parameters of the solid solutions prepared by both of the methods didn't vary linearly with Pb contents, and they have two turning points of 0.4 and 0.6 of Pb content. It was found that Pb ions in the solid solutions preferentially occupied the M (2) site in the apatite structure. HTMM gives Ca-Pb HA solid solutions much better crystallization. However, due to the formation of intermediate compound of

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