Dielectric properties and structure of hydroxyapatite ceramics sintered by different conditions

摘要: Several conditions for hydroxyapatite ceramic preparation were used: sintering at 1150 °C in air or under H 2 O vapor flow, quenched water room temperature after sintering, slow cooling inside the furnace. Depending on specific combinations of these conditions, resulting ceramics significant differences are observed phase composition and dielectric properties, ranging from capacitive to a semiconducting response. Comparison between experimental x-ray diffraction patterns those calculated by Rietveld method show that during air, approximately 40% is transformed tricalcium phosphate. The XRD analysis shows this transformation could be possible using following process: Ca 10 (PO 4 ) 6 (OH) = 2Ca 3 + P 7 2CaO O.