Oleg Karpov

Petersburg State Electrotechnical University · Department of Physical Chemistry

In this paper, the achievements, problems and prospects of creating personalized energy systems based on nanostructured materials are analyzed. Various concepts of developing methods and ways of personalized energy provision for autonomous human survival in remote natural habitats, emergencies of natural disasters and technogenic catastrophes when...

NdCoO3 nanocrystals formed via glycine–nitrate combustion method followed by heat treatment has been systematically studied. Formation of NdCoO3 nanocrystals with minimal size of 7–10 nm from X-ray amorphous combustion products has been elucidated to be a very rapid process, occurring at the temperature of 550–600 °C for 5–30 min. The comparison of...

Nanocrystals of Nd 1 − x Bi x FeO 3 were produced during the process of combustion of the glycine-nitrate with precursors together with an excess amount of the oxidizing agent. X-ray diffraction patterns and Raman spectra were measured for investigation of the structure of the synthesized material. Hidden periodicities were extracted in the Raman s...

Nd1–xBixFeO3 nanocrystals with crystallite size 30‒60 nm have been prepared under conditions of glycine–nitrate burning. Single-phase Nd1–xBixFeO3 nanocrystals are formed over the entire studied concentrations range if the glycine–nitrate synthesis is performed in excess of the oxidizer. Under these conditions, a continuous range of the Nd1–xBixFeO...

The sequence of phases appearance during the formation of Bi1–xNdxFeO3 solid solutions in powder oxides mixtures of bismuth, neodymium, and iron has been determined. It has been shown that the closeness of the reaction mixture composition to that of the individual compound (BiFeO3 or NdFeO3) is essential for the realization of the series of phase t...