Nechyporenko G. Molten salt synthesis and modification of disperse systems based on calcium apatite

The present thesis is devoted to the development of low-temperature method of synthesis of calcium apatites in ionic melts, establishing general regularities and features of the synthesis and modification of calcium apatites (CaHap, CaFap) in NaCl-KCl and NaNO3-KNO3 melts under different conditions. The thermodynamic predictions of substance solubilities and possible interactions in the melts at the synthesis of the calcium apatites are made. The modification of apatites under various conditions of synthesis and by the sorption is performed. CaFap was modified with Zr and Mn by the direct synthesis from corresponding fluorides (ZrF4 and MnF2) in molten NaCl-KCl. The features of the modification by Mn in air and in inert atmosphere are stated. Modification of CaHap and CaFap by 3d- (Ni2+, Cu2+) and 4d- metals (Pd2+, Ag+) show that the sorption abilities of apatite to the ions of these groups are quite different. The modifying of the apatites by Ag+ require appropriate auxiliary lanthanide ions Ln3+ (where Ln is Nd-Lu). The nanopowder of CaFap obtained by the developed low-temperature way of synthesis is used for treatment of tooth with hypersensitive dentin.