Grain-boundary effect in ceria doped with trivalent cations: I, electrical measurements

Journal Article · Mon Sep 01 00:00:00 EDT 1986 · J. Am. Ceram. Soc.; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1986.tb07464.x· OSTI ID:6656452

Gerhardt, R; Nowick, A S

The ''grain-boundary effect,'' which leads to a greatly reduced dc ionic conductivity due to the presence of a blocking layer in the vicinity of the grain boundaries, is studied in detail for ceria ceramics doped with various trivalent dopants (particularly Y/sup 3-/, Gd/sup 3+/, and La/sup 3+/). The effects of porosity, of sintering time, and of dopant size and dopant concentration are investigated. Finally, it is shown that the grain-boundary effect virtually disappears when nearly silicon-free starting materials are used.

• Research Organization: Henry Krumb School of Mines, Columbia Univ., New York, NY 10027
• OSTI ID: 6656452
• Journal Information: J. Am. Ceram. Soc.; (United States), Vol. 69:9
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERAMICS
CHEMICAL COMPOSITION
IONIC CONDUCTIVITY
CERIUM OXIDES
CRYSTAL DOPING
GRAIN BOUNDARIES
CATIONS
DIRECT CURRENT
DOPED MATERIALS
GADOLINIUM
LANTHANUM
LAYERS
POROSITY
QUANTITY RATIO
SINTERING
SIZE
STRUCTURAL CHEMICAL ANALYSIS
TIME DEPENDENCE
VALENCE
YTTRIUM
CERIUM COMPOUNDS
CHALCOGENIDES
CHARGED PARTICLES
CRYSTAL STRUCTURE
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ELEMENTS
FABRICATION
IONS
MATERIALS
METALS
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
RARE EARTHS
TRANSITION ELEMENTS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies
360204 - Ceramics
Cermets
& Refractories- Physical Properties