Sintering of Potassium Doped Hydroxy-Fluorapatite Bioceramics

The present study describes the influence of potassium and hydroxyl substitutions on structural, thermal mechanical properties fluorapatite bioceramics. A set non-stoichiometric ion-substituted compounds, with a chemical formula Ca10−xKx(PO4)6F(2−2x)(OH)x 0 ≤ x 1 synthesized by wet precipitation method, were found to be single-phase apatites crystallizing in hexagonal P63/m space group. structural parameters, as well crystallite sizes, increased accordingly amount added dopant-ions. behavior these studied within temperature range 500–1200 °C, indicated partial decomposition apatitic phase its transformation tricalcium phosphate β-Ca3(PO4)2 at temperatures exceeding 750 °C. relative density sintered samples achieved highest value = 0.25 reached about 95% after sintering 1050 °C for h. microstructures trans-granular aspect experienced an increase radius their pores increased. prepared bioceramic materials mechanically characterized means Young’s modulus, flexural strength fracture toughness measurements. overall trend parameters evolved comparably density, maximum values obtained measured 96 MPa, 47 MPa 1.14 MPa·m1/2, respectively.