PREPARATION AND FERROELECTRIC PROPERTIES OF STRONTIUM-DOPED HYDROXYAPATITE CERAMICS

Strontium-doped hydroxyapatite ceramics with good ferroelectric properties were prepared using 5 % bioactive phosphate glass as an additive at 700 °C in this paper. XRD, FTIR, SEM analyses and a ferroelectric tester were used to analyse the crystal structure, phase composition, microstructure and ferroelectric properties of the prepared ceramics. The results revealed that substitution of Ca 2+ by Sr 2+ in the HA lattice would lead to an increase in its lattice parameters and a decrease in crystallinity. Moreover, the lattice distortion and the increase in the electric dipole moment caused by the Sr 2+ doping enhanced the ferroelectric properties of the Sr-HA ceramics. Increasing the density of the samples could enhance their ferroelectric properties. The remnant polarisation intensity increased from 0.0156 μC∙cm-2 to 0.0728 μC∙cm-2, the maximum polarisation intensity increased from 0.1210 μC∙cm -2 to 0.1628 μC∙cm -2 .