Time filter

Source Type

Blagoveshchensk, Russia

Amur State University is a university in Blagoveshchensk, Amur Oblast, Russia. Wikipedia.

Chibisov A.N.,Russian Academy of Sciences | Chibisova M.A.,Amur State University
Technical Physics | Year: 2011

The influence of Ti and Zr impurity atoms on the atomic and electronic structures of a mesoporous SiO2 matrix is ab initio simulated in a generalized gradient approximation. Energetically favorable positions of titanium and zirconium in the structure are revealed. The incorporation of Zr and Ti ions is shown to decrease the bandgap. © 2011 Pleiades Publishing, Ltd.

Mikhailov M.M.,Tomsk State University | Li C.,Harbin Institute of Technology | Neshchimenko V.V.,Harbin Institute of Technology | Neshchimenko V.V.,Amur State University
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms | Year: 2014

Diffuse reflection spectra and absorption spectra of titanium dioxide (anatase) micro- and nanopowders induced by exposure to 100 keV protons and electrons were analyzed at wavelengths between 250 and 2500 nm. It is established that the radiation stability of the nanopowders is higher than the micropowders in the absorption region λ > 500 nm for proton and electron exposure. This effect is caused by the high concentration of radiation defects in micropowders, which is associated with defects of interstitial titanium ions (Tii, Tii), titanium vacancies (VTi″, VTi′) and oxygen vacancies VO X. © 2014 Elsevier B.V. All rights reserved.

The results of modeling the dynamic charging processes that arise when ferroelectrics are under the action of an electron beam in a scanning electron microscope are presented. Implementation of the model is based on simultaneous solution of the continuity equation and Poisson equation with allowance for the radiation-stimulated intrinsic conductivity of the irradiated sample and with an initial charge distribution determined using the Monte Carlo method. The multidimensional boundary evolutionary problem is solved using grid methods. The model permits one to study the dynamics of the process of the electron-beam-induced charging of ferroelectrics. Estimates for the values of fields generated by charges accumulated during the irradiation process are presented for a set of modeling parameters corresponding to physical data obtained in experimental observations of the polarization switch for a ferroelectric lithium niobate crystal. © 2013 Pleiades Publishing, Ltd.

Stukova E.V.,Amur State University
Bulletin of the Russian Academy of Sciences: Physics | Year: 2013

The effect of small BaTiO3 particles (2-30 μm) on the ferroelectric properties of TGS in (TGS)1-x -(BaTiO3) x composite and KNO3 in (KNO3)1 - x -(BaTiO3) x composite is studied. It is shown that there is a mutual effect between individual components in the ferroelectric composites that could be due to dipoledipole interaction. The effect of the components in the composites is determined not only by the concentration of particles of inclusions, but also by their size. © 2013 Allerton Press, Inc.

Mikhailov M.M.,Tomsk State University | Neshchimenko V.V.,Amur State University | Yuryev S.A.,Tomsk State University
Radiation Physics and Chemistry | Year: 2016

This study carried out an in situ and external investigation on the reflective spectra of micro- and nanopowders titanium dioxide before and after irradiation by 30keV electrons. The particle sizes range from 60-240nm. It was established that the decrease in the particle size leads to an increase in intrinsic defects. The particles with intrinsic defects are then transformed into absorption centers during irradiation as a result of optical degradation of TiO2 powders. High radiation stability has particle sizes range from 80-160nm. © 2015 Elsevier Ltd.

Discover hidden collaborations