Dielectrical and structural characterization of iron oxide added to hydroxyapatite

In this work we report preparation, structural and dielectric analyses of iron oxide added in hydroxyapatite bioceramic (Ca₁₀(PO₄)₆(OH)₂ — HAP). Hydroxyapatite is the main mineral constituent of teeth and bones with excellent biocompatibility with hard and muscle tissues. The samples were prepared through a calcination procedure associated with dry high-energy ball milling process with different iron concentrations (1, 2·5 and 5 wt%). The dielectric analyses were made measuring the sample impedance in the frequency range 1 kHz–10 MHz, at room temperature. The relative permittivity of the ceramics, at 10 MHz, are between 7·13 ± 0·07 (1 wt%) and 6·20 ± 0·11 (5 wt%) while e ⁿ are between 0·0795 ± 0·008 (1 wt%) and 0·067 ± 0·012 (5 wt%). These characteristics were related to the sample microstructures studied by X-ray diffraction and SEM.