Strontium-substituted hydroxyapatite(SrHA)crystal coatings on titanium substrate were deposited by an electrochemical method.SrHA crystals with Sr/(Ca+Sr)ratio ranging from 0 to 100% and different crystallinity was controllably synthesized by changing the composition and concentration of electrolytes.Deposition in the electrolytes of lower Ca,P concentration at higher temperature resulted in larger hexagonal rod-like SrHA crystals,while deposition in the electrolytes of higher Ca,P concentration at lower te...