Hydroxyapatite based nanocomposite ceramics

Lanthanum-doped hydroxyapatite ceramics were synthesized by the sol gel method and their chemical composition analyzed by FTIR and EDS. SEM observations showed all samples to exhibit a spherical nanoparticles nanostructure. The electrical properties of La doped HAp ceramics were investigated by dielectric and polarization -voltage measurements. The dielectric constant, er increased gradually with the amount of lanthanum doping. A non-Debye type dielectric relaxation mechanism was observed as well as a ferroelectric behavior. Results indicate that La doping improves the electrical and ferroelectric properties of hydroxyapatite ceramics. (C) 2017 Elsevier B.V. All rights reserved.