Results 251 to 260 of about 221,530 (305)

Proton and oxygen-ion conductivity of Ba4Ca2Nb2O11

Solid State Ionics, 2003
Abstract The structure, conductivity and water uptake of the oxygen-deficient compound Ba 4 Ca 2 Nb 2 O 11 have been investigated. Ba 4 Ca 2 Nb 2 O 11 is found to crystallize in the cryolite structure with a =8.4449 A. The compound may be fully hydrated up to maximum water content approximately 1 mol H 2 O per mol Ba 4 Ca 2 Nb 2 O 11 , this ...
I. Animitsa, A. Neiman, N. Kochetova, B. Melekh, A. Sharafutdinov   +4 more
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Microstructural aspects of oxygen ion conduction in solids

Solid State Ionics, 2000
The microstructure of solid electrolyte ceramics plays a key role in defining the level of ionic conduction of the material. The polycrystalline nature and the metastable state of most practically useful materials require that the conducting ion must negotiate a series of interfacial features during the conducting process.
Drennan, J., Auchterlonie, G. J.
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Oxygen-ion conductivity and catalysis

Solid State Ionics, 2000
Abstract Oxygen-ion conducting solid electrolyte electrochemical cells were prepared with both Fe 2 O 3 –Sb 2 O 4 and Pt working electrodes. The working electrode served as both catalyst, for a heterogeneous catalytic reaction taking place in the electrode compartment, and electrode.
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Oxygen ion conductivity in selected ceramic oxide materials

Solid State Ionics, 1988
Ionic conductivity measurements have been made on several novel oxide systems including tetragonal Zr 1–2x In 2x O 2−x , the perovskite related structure Sr 3 Ti 2 O 7 doped with Al or Mg, and cryolite type structures A 6 B 2 O 11 (A=Sr, Ba; B=Nb, Ta).
X. Turrillas, A.P. Sellars, B.C.H. Steele   +2 more
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Electrical Conduction by Oxygen Ions in Cerium Oxide

The Journal of Chemical Physics, 1966
Oxygen gas was observed by means of a mass spectrometer to be evolved from calcium-doped ceramic cerium oxide when direct current was passed through it at 450°C. The applied voltage necessary to cause the electrolysis was about 100 V across a sample 4 mm long containing 0.86 at. % calcium.
E. L. Holverson, C. J. Kevane
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Ionic conductivity of oxygen ions in YBa2Cu3O7−x

Solid State Ionics, 1989
Abstract The ionic conductivity of oxygen ions in YBa 2 Cu 3 O 7 −x has been measured at constant partial pressure of oxygen as a function of temperature between 300 and 500°C. A four-probe dc technique was applied with four oxygen-ion conducting electrodes.
W CARRILLOCABRERA, H WIEMHOFER, W GOPEL
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Oxygen ion conduction and structural disorder in conductive oxides

Journal of Physics and Chemistry of Solids, 1994
Abstract Defect-free crystals do not conduct ions. Increasing disorder initially translates into enhanced atomic transport. Heavily defective crystals, however, often exhibit successively lower levels of atomic diffusivity as the defect level is increased.
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Oxygen ion conduction in ?-Bi2O3 doped with Sb2O3

Journal of Materials Science, 1986
Electrical conduction in bccγ-Bi2O3 doped with Sb2O3 was investigated by measuring electrical conductivity, as a function of temperature and oxygen partial pressure\(P_{{\text{0}}_2 } \), and ionic transference number. Theγ-Bi2O3 doped with 1 to 3 mol% Sb2O3 was stable up to 550° C and showed an oxygen ionic conduction in the\(P_{{\text{0}}_2 ...
Masaru Miyayama, Hiroaki Yanagida
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Protonic and oxygen-ion conduction in SrZrO3-based materials

Journal of Materials Science, 1995
Strontium zirconate-based materials have been studied as potential high-temperature protonic conductors. Yttrium for zirconium substitution, and lanthanum for strontium substitution were selected to demonstrate that changes in composition can be used as a tool to design the properties. At temperatures below about 900 ° C, both yttrium-doped and undoped
J. A. Labrincha, F. M. B. Marques, J. R. Frade   +2 more
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Electrical properties of mixed-conducting oxides having high oxygen-ion conductivity

Solid State Ionics, 1992
Abstract Significant electronic conductivity is introduced into yttria-stabilized zirconia (YSZ) by the dissolution of titania. The important factors establishing the electronic conductivity at a constant temperature include the solid solubility of the multivalent metal oxide in YSZ, the impurity content of YSZ, and the oxygen pressure.
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