Home – Home – Jornals – Chemistry for Sustainable Development 2019 number 3

Results of the investigation of the structure of zinc-substituted hydroxyapatite formed during low-temperature solid phase mechanochemical synthesis are presented. . It is shown that a single-phase zinc-substituted hydroxyapatite with a degree of substitution of up to 0.4 mol per mole of apatite is formed in a planetary ball mill AGO-2 after 30 minutes of mechanical impact on the mixture of initial reagents (CaHPO4, CaO, Zn(H2PO4)2•2H2O). Two types of substitution reactions for zinc ions were studied: the substitution of calcium ions and hydroxide ions. The dynamics of lattice parameters of the synthesized samples showed that zinc ions most probably occupy the positions of calcium ions in the course of mechanochemical synthesis. After high-temperature treatment, the positions of zinc ions change: they are moved into the hydroxyl channel on the c axis, displacing OH groups and forming O-Zn-O chains elongated along the c axis. The limit of substitution in this case is reduced to 0.2 mol of zinc. The synthesized samples may be used to obtain medical bioresorbable hardware and coatings with antibacterial properties.