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1.
L. A. Dunyushkina A. V. Kuz’min V. B. Balakireva V. P. Gorelov 《Russian Journal of Electrochemistry》2006,42(4):375-380
Transport numbers for oxygen ions and protons are measured by an emf method in the system CaTi1?x FexO3?δ (x = 0.1–0.5) in the oxidizing and reducing atmospheres in the temperature interval 973–1173 K. It is shown that the compounds under study are mixed ion-electron conductors at small iron concentrations and electron conductors, at large iron contents. The proton conductivity in the compounds is very poor and does not exceed 0.5% in air. On the basis of the temperature dependences of transport numbers for ions and linear expansion, it is established that the CaTi0.9Fe0.1O3?δ system has a phase transition of a second order in a reducing environment at 1020–1050 K. The total and partial electron conductivities of CaTi0.9Fe0.1O3?δ are studied as a function of the partial pressure of oxygen at 1173 K. The nature of electroconduction in CaTi1?x FexO3?δ is discussed. 相似文献
2.
Gorelov V. P. Kuzin B. L. Balakireva V. B. Sharova N. V. Vdovin G. K. Beresnev S. M. Kleshchev Yu. N. Brusentsov V. P. 《Russian Journal of Electrochemistry》2001,37(5):505-511
The electroconductivity and the nature of conduction of vacuum-dense ceramics BaPr1 – x
Y
x
O3 – (x= 0.05–0.15) is studied at temperatures of 373 to 985°C,
of 2.1 × 104to 10–11Pa, and
of 40 to 2400 Pa. The coefficient of linear thermal expansion is measured. The ceramics have a perovskite structure and are practically p-type semiconductors with a maximum conductivity of 0.26 S cm–1at x= 0.10 and 800°C, in air. The share of ionic (proton) conductivity of the ceramics does not exceed 0.2–0.4%. The conductivity is weakly dependent on the air humidity. In a hydrogen-containing atmosphere, the ceramics undergoes reduction with destruction. Boundaries of thermodynamic stability of BaPr0.9Y0.1O3 – at 500–900°C are determined. 相似文献
3.
N. M. Bogdanovich V. P. Gorelov V. B. Balakireva T. A. Demyanenko 《Russian Journal of Electrochemistry》2005,41(5):576-581
The phase composition and electroconduction in air of solid electrolytes (Ce0.8Sm0.2)1 − x
CuxO2 − δ (CSCu), where x = 0, 2, 5, 10, and 20 mol % and which are synthesized using the ceramic technology, are studied. Adding an additive of CuO lowers the CSCu sintering temperature by 100– 200°C and leads to the formation of single-phase solid solutions of a fluorite type up to x = 10 mol %. The electroconductivity of the CSCu electrolytes remains practically invariant upon adding up to 5 mol % Cu and equals 0.089–0.095 and 0.017–0.021 S cm−1 at 800 and 600°C. The sintering, adhesion, and electroconductance of composite cathodes based on La0.8Sr0.2MnO3 with 40% CSCu and their electrochemical behavior in air in the temperature interval 900–1000°C on carrying electrolyte Zr0.9Y0.1O1.95 with a CSCu sublayer containing 2 mol % Cu are studied.__________Translated from Elektrokhimiya, Vol. 41, No. 5, 2005, pp. 656–661.Original Russian Text Copyright © 2005 by Bogdanovich, Gorelov, Balakireva, Dem’yanenko. 相似文献
4.
V. P. Gorelov V. B. Balakireva A. V. Kuz’min 《Russian Journal of Electrochemistry》2010,46(8):890-895
Ionic, proton, and oxygen conductivities are measured as functions of air humidity (pH2O = 0.04−3.57 kPa) in the BaZr1 − x
Y
x
O3 − α system (x = 0.02−0.15) over the temperature range 600–900°C. The important result is obtained that dissolved water vapor determines
not only proton transport, but also the overwhelming part of oxygen transport in BaZr1 − x
Y
x
O3 − α. 相似文献
5.
V. B. Balakireva A. V. Kuz’min V. P. Gorelov 《Russian Journal of Electrochemistry》2010,46(7):749-753
Proton and deuteron conductivities in the BaZr1 − x
Y
x
O3 − δ system (x = 0.02–0.2) are investigated experimentally over the temperature range 600–900°C in reducing H2/H2O and D2/D2O atmospheres with pH2O = pD2O = 3.15 kPa. 相似文献
6.
Balakirev A. E. Maizlish V. E. Balakireva O. V. Shaposhnikov G. P. Bykova V. V. Usol'tseva N. V. 《Russian Journal of General Chemistry》2004,74(2):295-299
Acylation of 4-amino-5-nitro-, 5-amino-4-bromo-, 5-amino-4-phenoxy-, 4-hydroxy-5-nitro-, 3- and 4-hydroxyphtalonitriles with p-undecyloxybenzoyl chloride gave the corresponding acyl derivatives which were used to prepare copper and cobalt phthalocyanines. Physicochemical properties of the resulting products were studied. The synthesized metal complexes all exhibit mesomorphic properties. 相似文献
7.
We revisit F π(Q 2) and F Pγ(Q 2), P = π, η, η′, making use of the local-duality (LD) version of QCD sum rules. We give arguments that the LD sum rule provides reliable predictions for these form factors at Q 2 ≥ 5–6 GeV2, the accuracy of the method increasing with Q 2 in this region. For the pion elastic form factor, the well-measured data at small Q 2 give a hint that the LD limit may be reached already at relatively low values of momentum transfers, Q 2 ≈ 4–8 GeV2; we therefore conclude that large deviations from LD in the region Q 2 = 20–50 GeV2 seem very unlikely. The data on the (η, η′) → γγ* form factors meet the expectations from the LD model. However, the BaBar results for the π 0 → γγ* form factor imply a violation of LD growing with Q 2 even at Q 2 ≈ 40 GeV2, at odds with the η, η′ case and with the general properties expected for the LD sum rule. 相似文献
8.
Balakireva V. B. Gorelov V. P. Dunyushkina L. A. Kuz’min A. V. 《Physics of the Solid State》2019,61(4):515-522
Physics of the Solid State - The total, bulk, and grain boundary conductivities of proton-conducting zirconates of general formula AZr0.95Sc0.05O3 – α (AZS), where A =... 相似文献
9.
10.
V. P. Gorelov V. B. Balakireva I. Yu. Yaroslavtsev V. A. Kazantsev E. G. Vaganov 《Russian Journal of Electrochemistry》2007,43(8):888-893
Highly compact (99%) solid electrolyte Ce0.8Gd0.2O1.9 with submicron (0.3 μm) grains is synthesized. The dilatometric (20–850°C) and conductivity (180–350°C) measurements are performed on the electrolyte in air and as a function of the partial oxygen pressure \(p_{O_2 } \) (0.21?1×10?25 atm) at 600, 700, and 800°C. An inflection is found in the temperature dependences of the thermal coefficient of linear expansion and conductivity (impedance measurements) at ~230°C, which is the evidence for a phase transition. The activation energies for conduction in the grain bulk and boundaries differ only slightly, indicating that the grain boundaries’ resistance is caused not by the precipitation of the second phase at the boundaries, but most probably by the presence of intergranular nanopores. The dilatometric measurements confirm a significant increase in the linear dimensions of Ce0.8Gd0.2O1.9 in the reducing atmospheres with a parallel increase in its electron conductivity. The electron conductivity and specific elongation increase proportionally to \(p_{O_2 }^{ - 1/4} \) at all temperatures. The \(p_{O_2 } \) values, at which the transport numbers of ions t i = 0.5, are determined. They are 10?22.5, 10?20, and 10?18 atm at 600, 700, and 800°C, respectively. 相似文献