title: Mechanochemical synthesis of nanocrystalline hydroxyapatite from CaO and CaHPO4.
abstract: Ceramic hydroxyapatite phase was triggered to occur by high-energy mechanical activation of a dry powder mixture of calcium oxide (CaO) and anhydrous calcium hydrogen phosphate (CaHPO4). A singe-phase hydroxyapatite of high crystallinity was realised by >20 h of mechanical activation without further thermal treatment at high temperatures. The resulting hydroxyapatite powder exhibits an average particle size of approximately 25 nm and a specific surface area of 76.06 m2/g, as measured by multi-point BET technique. It was sintered to a density of 98.20% theoretical density at 1200 degrees C for 2 h.
authors.affiliation: Department of Materials Science, Faculty of Science, National University of Singapore, Singapore.
authors.forename: K C
authors.initials: KC
authors.lastname: Yeon
authors.forename: J
authors.initials: J
authors.lastname: Wang
authors.forename: S C
authors.initials: SC
authors.lastname: Ng
mesh_terms: D017610:Calcium Compounds / Q000737:chemistry*; D002130:Calcium Phosphates / Q000737:chemistry*; D003460:Crystallization; D018360:Crystallography, X-Ray; D017886:Durapatite / Q000138:chemical synthesis* / Q000737:chemistry; D008854:Microscopy, Electron / Q000379:methods; D010087:Oxides / Q000737:chemistry*
chemical_list: D017610:Calcium Compounds; D002130:Calcium Phosphates; D010087:Oxides; C485828:alpha-tricalcium phosphate; C485830:tetracalcium phosphate; C485838:calcium phosphate, monobasic, anhydrous; D017886:Durapatite; C020243:calcium phosphate; C016538:lime; C485829:calcium phosphate, dibasic, anhydrous