Abstract
Strontium hydroxyapatites substituted by alkali metals are synthesized by double decomposition method in basic medium. Structures of Sr 9.50Na 0.30(PO 4) 6(OH) 1.30 (SrNaHAp) and Sr 9.81K 0.12(PO 4) 6(OH) 1.74 (SrKHAp) are determined by X-ray powder diffraction. Both compounds are isotypic and crystallize in hexagonal system (space group P63/ m) with the following cells: a=9.751(3) Å and c=7.279(3) Å for SrNaHAp and a=9.755(4) Å and c=7.284(3) Å for SrKHAp. Results are compared to those of Sr 10(PO 4) 6(OH) 2. According to the site occupancy factors, in SrNaHAp sodium is localized in site (I) and in SrKHAp potassium in site (II). Both structures contain vacancies in hydroxyl and metal sites. The mechanism of alkali metals substitution for strontium proposed explains the vacancies formation.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
