Defect structure, ionic conductivity, and diffusion in yttria stabilized zirconia and related oxide electrolytes with fluorite structure

Journal Article · Fri Aug 01 04:00:00 EDT 1986 · J. Electrochem. Soc.; (United States)

DOI:https://doi.org/10.1149/1.2108965· OSTI ID:6998514

Nakamura, A; Wagner, Jr, J B

Ionic conductivity data of yttria zirconia, Y/sub 4x/Zr/sub 1-4x/O/sub 2-2x/, reported in the literature as functions of oxygen vacancy concentration, x, and temperature, T, have been analyzed according to a theoretical model developed in a previous paper and applied to calcia stabilized zirconia. Because of the different charge compensation mechanism in yttria stabilized zirconia, Y/sub 4x/Zr/sub 1-4x/O/sub 2-2x/, than that in calcia stabilized zirconia, Ca/sub 2x/Zr/sub 1-2x/O/sub 2-2x/, the theory predicts the occurrence of a maximum of ionic conductivity at an oxygen vacancy concentration, x = 0.03125 (= 1/32), which is just half the oxygen vacancy concentration at the maximum, x = 0.0625 (= 1/16), in calcia stabilized zirconia. This was clearly confirmed by recent experimental results of Ioffe et al. and appears to substantiate further the basic validity of the theoretical model. Results of the theoretical analysis on yttria stabilized zirconia obtained herein are compared with those on calcia stabilized zirconia are also discussed in relation to the ionic conductivity data of the various rare earth oxide-stabilized zirconia systems. The basic assumptions and limitations of the theoretical model are critically examined, and possible modifications of the theoretical model are suggested.

• Research Organization: Center for Solid State Science and Departments of Chemistry, Mechanical, and Aerospace Engineering and Physics, Arizona State Univ., Tempe, AZ 85287
• OSTI ID: 6998514
• Journal Information: J. Electrochem. Soc.; (United States), Journal Name: J. Electrochem. Soc.; (United States) Vol. 133:8; ISSN JESOA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CALCIUM FLUORIDES
CALCIUM HALIDES
CALCIUM OXIDES
CHALCOGENIDES
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DATA ANALYSIS
DIFFUSION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROLYTES
ELEMENTS
FLUORIDES
FLUORINE COMPOUNDS
FLUORITE
HALIDE MINERALS
HALIDES
HALOGEN COMPOUNDS
IONIC CONDUCTIVITY
MATHEMATICAL MODELS
MINERALS
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POINT DEFECTS
QUANTITY RATIO
RESEARCH PROGRAMS
STABILIZATION
TEMPERATURE DEPENDENCE
TESTING
TRANSITION ELEMENT COMPOUNDS
VACANCIES
VALIDATION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES