Protonic and oxygen-ion conduction in solid oxide electrolytes: Final report, January 1, 1985-March 31, 1988. [KTaO/sub 3/ and SrCeO/sub 3/]

Technical Report · Fri Jan 01 04:00:00 EST 1988

OSTI ID:6844940

Nowick, A S

This project has focused primarily on protons in perovskite-related oxides. Particular attention has been given to KTaO/sub 3/ containing acceptor (transition-metal ion) dopants, which is available as high quality single crystals, and for which the H/sup +/ concentration can be monitored through IR absorption. Techniques used for this study were: electrical conductivity, low-temperature dielectric relaxation, isotope effect on the conductivity (by substituting deuterons for protons), IR absorption and EPR Measurements on the dopants ions. We have observed several dielectric loss peaks, due to Ni, Co, and Mn dopants. No evidence for conduction by the oxygen-ion vacancy was found, but in the reduced state it is possible to obtain electronic small-polaron hopping processes. Other work included the study of ceramic samples of Yb-doped SrCeO/sub 3/, for which a low activation energy for protonic migration of 0.65 eV was found. Finally, an approach to analyzing the pre-exponentials of conductivity was developed and applied in an extensive survey of different fast-ion conductors.

• Research Organization: Columbia Univ., New York (USA). Henry Krumb School of Mines
• DOE Contract Number: FG02-85ER45187
• OSTI ID: 6844940
• Report Number(s): DOE/ER/45187-9; ON: DE88017091
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ACTIVATION ENERGY
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ARRHENIUS EQUATION
BARYONS
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
CHARGED PARTICLES
COBALT IONS
COPPER IONS
CRYSTAL DOPING
DOCUMENT TYPES
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELEMENTARY PARTICLES
ENERGY
EQUATIONS
FERMIONS
HADRONS
IONIC CONDUCTIVITY
IONS
IRON IONS
ISOTOPE EFFECTS
MANGANESE IONS
MATERIALS
NICKEL IONS
NUCLEONS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POTASSIUM COMPOUNDS
POTASSIUM OXIDES
PROGRESS REPORT
PROTONS
RARE EARTH COMPOUNDS
REFRACTORY METAL COMPOUNDS
RELAXATION
SPECTRA
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
TANTALUM COMPOUNDS
TANTALUM OXIDES
TRANSITION ELEMENT COMPOUNDS
YTTERBIUM IONS