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Oxygen Permeability of Mixed Conducting Perovskite Lanthanum Gallate-Based Ceramics
Politova, Ekaterina D.,Aleksandrovskii, Vladimir V.,Zaitsev, Sergey V.,Kaleva, G.M.,Mosunov, Alexander V.,Stefanovich, Sergei Yu.,Avetisov, A.K.,Suvorkin, S.V.,Kosarev, G.V.,Sukhareva, I.P.,Sung, Jae Trans Tech Publications, Ltd. 2006 Materials science forum Vol.514 No.-
<P>The structure, microstructure, electric transport and oxygen permeation properties of (La,Sr)(Ga,Mg,Fe)O3-δ ceramics with perovskite or brownmillerite structures have been studied. Oxygen permeability values of ~0.1 cm3/cm2·min has been revealed at 1000 K for the ceramics studied. The correlation of electroconducting properties of the LaGaO3-based ceramics with perovskite and brownmillerite structures to their oxygen permeability characteristics has been proved.</P>
ICT-oriented Training of Future HEI Teachers: a Forecast of Educational Trends 2022-2024
Olena, Politova,Dariia, Pustovoichenko,Hrechanyk, Nataliia,Kateryna, Yaroshchuk,Serhii, Nenko International Journal of Computer ScienceNetwork S 2022 International journal of computer science and netw Vol.22 No.4
The article reflects short-term perspectives on the use of information and communication technologies in the training of teachers for higher education. Education is characterized by conservatism, so aspects of systematic development of the industry are relevant to this cluster of social activity. Therefore, forecasting the introduction of innovative elements of ICT training is in demand for the educational environment. Forecasting educational trends are most relevant exactly in the issues of training future teachers of higher education because these specialists are actually the first to implement the acquired professional skills in pedagogical activities. The article aims to consider the existing potential of ICT-based learning, its implementation in the coming years, and promising innovative educational elements that may become relevant for the educational space in the future. The tasks of scientific exploration are to show the optimal formats of synergy between traditional and innovative models of learning. Based on already existing experience, extrapolation of conditions of educational process organization with modeling realities of using information and communication technologies in various learning dimensions should be carried out. Educational trends for the next 3 years are a rather tentative forecast because, as demonstrated by the events associated with the COVID-19 pandemic, the socio-cultural space is very changeable. Consequently, the dynamism of the educational environment dictates the need for a value-based awareness of the information society and the practical use of technological advances. Thus, information and communication technologies are a manifestation of innovative educational strategies of today and become an important component along with traditional aspects of educational process organization. Future higher education teachers should develop a training strategy taking into account the expediency of the ICT component.
Perovskite계 La_(0.9)Sr_(0.1)(Ga_(1-x)Fe_(x))_(0.8)Mg_(0.2)O_(3- δ) 의 제조 및 특성
추고연,김태환,김권일,Politova, E. D.,성재석 한국공업화학회 2004 응용화학 Vol.8 No.1
In this paper, perovskite-type La_(0.9)Sr_(0.1)(Ga_(1-X)Fe_(X))_(0.8)Mg_(0.2)O_(3-6)(x=0-0.5) powders were prepared by solid state reaction, followed by estimation of phase structures and properties according to Fe contents and sintering conditions. Impurity phases as well as perovskite phase were observed in the powders which were calcined at 800℃ for 10h followed by sintering at 1300℃ for 10h. The smallest amount of the impunrity phases was observed in the powder with the highest Fe content. The X-ray diffraction peaks corresponding to the 220 peak in pseudo cubic lattice were collected. The data were used for calulation of orthorhombic unit cell parameters by PROFITVZ program. Mean unit cell parameters(V^(1/3)) decreased with x at the Fe contents not more than 0.2 and increased with x at the Fe contents not less than 0.3. Electrical conductivity of the bar-like samples was measured as a function of temperature from 290K up to 1200K in air by a standard two-probe technique using platinum electrodes. The relationship between lot(oT) and l/T as lkHz exhibited the Arrhenius behavior, Electrical conductivity increased with Fe contents. Particularly, Fe contents substantially contributed to electrical conductivity at lower temperature. In air, La_(0.9)Sr_(0.1)(Ga_(0.75)Fe_(0.25))_(0.8)Mg_(0.2)O_(3-6) perovskie-type oxide showed the reversible elongation property in which the structural phase transition occurred at near 600℃.