Hydrothermal synthesis and crystallographic study of Sr-Pb hydroxyapatite solid solutions

Abstract

A continuous series of solid solutions in the system of strontium and lead hydroxyapatite, PbxSr1-xHAP (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 Riet-veld method. The lattice constants of the prepared solid solutions varied linearly with Pb contents. It was found that Pb2+ ions in the solid solutions preferentially occupied the M (2) site in the apatite structure.