S. M. Beresnev

Electroconductivity, Nature of Conduction, Thermodynamic Stability of the BaPr1 –xYxO3 – αCeramics

AbstractThe electroconductivity and the nature of conduction of vacuum-dense ceramics BaPr1 – xYxO3 – α(x= 0.05–0.15) is studied at temperatures of 373 to 985°C,

Single solid-oxide fuel cells with supporting ni-cermet anode

P_{0_2}

Options for adjustment of microstructure and conductivity of cathodic substrates of La(Sr)MnO3

of 2.1 × 104to 10–11Pa, and

Nickel-cermet electrodes for high-temperature electrochemical devices made using nanomaterials

P_{{\text{H}}_2 0}

Symmetrical solid oxide fuel cell with strontium ferrite-molybdenum electrodes

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 – αat 500–900°C are determined.

Single SOFC with Supporting Ni-YSZ Anode, Bilayer YSZ/GDC Film Electrolyte, and La2NiO4 + δ Cathode

Abstract Electrical conductivity, Raman scattering (RS) spectra, and thermal expansion of the solid solution based on lanthanum gallate having the formula La0.88Sr0.12Ga0.82Mg0.18O2.85 (LSGM12–18) were studied as a function of temperature. X-ray diffraction analysis (XDA) of the samples at room temperature was performed. A dilatometric examination demonstrated that phase transitions of the second order took place at 775±10 and 880±20 K. The transition at 880 K was confirmed both by Raman scattering spectra and by a change in the activation energy of the electrical conductivity. This phase transition is probably due to a change of the oxygen sublattice symmetry.