Description

The project is aimed at studying the effect of thermochemical generation of high-density charges in precursors during the synthesis of nanosized complex oxides by means of combustion reactions and its usage in order to control the characteristics of the obtained materials, such as morphology, the degree of contact between particles, sintering of powders (the temperature of the beginning of intensive sintering and its interval, the achieved shrinkage). This phenomenon has been discovered, but it was not studied and used enough, although recently it was found that it can greatly affect the properties of the resulting nanoscale oxide systems. These studies are relevant both in scientific and practical terms and they would establish new fundamental physico-chemical laws of the synthesis of complex oxides. The possibility of this effect’s usage is high, because it gives an opportunity of purposeful regulation of the key properties of oxide powders and coatings with minimal costs. During the research it is planned to obtain data on the dependence of the intensity of charges’ generation from the ratio of the components in the precursor (between nitrate and the organic component), the nature of the organic component (such polymers as polyvinyl alcohol, polyvinylpyrrolidone, polyacrylamide, polyethylene glycol, cellulose, or low-molecular compounds – glycine, glycerin), and composition of the surrounding gas environment. Complex oxides with perovskite structure (on the basis of lanthanum manganite) and fluorite structure (cerium oxide doped with metal ions of different nature for example copper, potassium or iron) would be synthesized as model systems in order to simulate the proses of charges’ generation. Experiments would be carried out in order to determine the presence of charges during the synthesis of complex oxide coatings on metal and ceramic carriers. In addition to measuring precursor’s charges such parameters as combustion temperature (during synthesis), phase composition (x-ray phase analysis), product’s morphology (electron microscopy), specific surface area, sintering parameters of ceramic billets (precision dilatometry) will be monitored during the research by means of special equipmen
StatusActive
Effective start/end date01/01/201931/12/2021

Keywords

  • RFFI
  • Kuibyshev Research Division