A single-stage innovative method of nano-sized hydroxyapatite Ca5(PO4)3OH (grain size equal 80 nm) synthetizing from aqueous solution was developed. This method is based on interaction between phosphoric acid solution and calcium nitrate in conditions, which are identical to conditions of hydroxyapatite formation in human organism. Structural and thermalphysic investigations of the compound were carried out using methods of high-temperature X-ray diffraction and differential scanning calorimetry. A big isomorphic capacity of apatite structure let us to suggest a number of chemical-modified hydroxyapatite creating ways. These modifications include such substitutions like “phosphorus-silicon”, “calcium-lanthanides”, “hydroxyl-fluorine”. Particularly hydroxyapatite doped by rare-earth elements can be used as an environmentally acceptable luminescent material. Isothermal batch reactor for a commercial production of hydroxyapatite was designed. Optimal conditions for the creating of hydroxyapatite-based bioceramic with controllable volume porosity were selected. Produced ceramic samples can be used in medical techniques for example in bone tissue engineering. Several steps of preclinical test were successfully passed. A new hybrid material which can be represented as high-porous hydroxyapatite ceramic impregnated with degradable polymer (chitosan) was obtained and its strength properties were investigated. For the first time the method of obtaining of hydroxyapatite whiskers (one-dimensioned dislocation-free crystals) using scheme “vapor-liquid-solid” was worked out. These whiskers can be used as a filling compound in composite materials. An improvement of hydroxyapatite sputtering on metallic and ceramic surfaces technique is also one of the most interesting areas of investigations.
Proceedings of the 2nd International Seminar on Chemistry. – 2011. – P. 47-50.

High ionic conductivity of doped ceria at comparatively lower operating temperatures (not, vert, similar650 °C) makes it suitable solid oxide fuel cell (SOFC) electrolyte. In the present investigation, successful attempt has been made to synthesize Ce0.9Gd0.1O1.95 (GDC10) solid solution by cost effective and simple chemical method of combustion where in the combustion of precursors results in the formation of nanoparticles relatively at lower processing temperature. The thermogravimetric study was carried out to understand the ignition temperature and optimize the fuel-to-oxidant ratio. The successful synthesis of single phase nanocrystalline GDC10 was confirmed by XRD, TEM and particle size analysis. Further SEM and surface measurements were carried out to confirm higher sample densities.

In recent years, doped ceria is an established and promising candidate as solid electrolyte for intermediate temperature solid oxide fuel cell (IT-SOFC). In this investigation, synthesis and characterizations of nano-crystalline Gd doped ceria, (Ce1−xGdxO2−x/2, where x = 0–0.3), prepared using glycine–nitrate process (GNP) has been presented. Evolution of structural and morphological properties of nano-powders as a function of heat treatment has also been studied. The prepared samples were characterized using TG–DTA, FT-IR, Raman spectroscopy, XRD, SEM, etc. In addition, the effect of Gd content over the micro-structural properties of nano-crystalline Gd doped ceria was investigated. Raman analysis of calcined powders confirms the formation of the solid solution of Ce1−xGdxO2−x/2 instead of mixture of CeO2 and Gd2O3. The solid solutions obeyed Vegard's rule very well. Grain growth of sintered samples was observed to hinder with an increase in Gd content.