Structural and dielectric characterization of Potassium diphosphate/Hydroxyapatite ceramic biocomposite

We study the KH2PO4 (KDP) /Ca10(PO4)6(OH)2 (HA) biocomposite to evaluate its electrical conductivity. It was prepared by manual grinding on a 1:3 molar ratio. Studies by X-ray powder diffraction and Raman spectroscopy show a variation in the volume of the unit cell between KDP and HA and the disappearance of bands associated with KDP. Impedance spectroscopy was studied over a range of temperatures (25-80 ºC) and frequencies from 10 Hz to 1 MHz. It was found that the bulk resistance of the composite is higher in pure KDP. Using the Jonscher empirical expression suggest that the ionic hopping conduction mechanism is responsible for the conductivity behavior with hopping frequency of 1.21 x104 Rad at 80ºC.