Electrical conductivity and thermodynamic behavior of SrO-doped nonstoichiometric cerium dioxide

Journal Article · Thu Jan 01 04:00:00 EST 1976 · J. Solid State Chem.; (United States)

DOI:https://doi.org/10.1016/0022-4596(76)90003-7· OSTI ID:7290298

Blumenthal, R N; Garnier, J E

Electrical conductivity and thermogravimetric measurements were made on SrO-doped nonstoichiometric cerium dioxide (i.e., Ce/sub 1-y/Sr/sub y/O/sub 2-y-x/) as a function of temperature (approximately 700 to 1500/sup 0/C) and oxygen partial pressure (approximately 1 to 10/sup -21/ atm). Assuming limiting case defect models, the ionic (sigma/sub i/) and electronic (sigma/sub e/) conductivities were calculated. In the region where y much greater than x (i.e., at low temperatures and high oxygen pressures) the conductivity is independent of P/sub O/sub 2// and up to approximately 3 mole percent SrO, it is proportional to mole percent SrO. The equation for ionic conductivity, sigma/sub i/ is approximately equal to (4.5 +- 0.5)(m/o SrO) exp (--0.58/kT), was obtained by fitting the conductivity data in this region to an expression derived on the basis of an oxygen vacancy model. In the composition region between approximately x = 10/sup -3/ and x = 10/sup -2/, both the thermodynamic behavior and the electrical conductivity was shown to be consistent with a defect model involving randomly distributed doubly ionized oxygen vacancies and electrons localized on normal cerium sites. In this region the electronic conductivity varies linearly with x and the electronic mobility decreases with increasing SrO content. (auth)

• Research Organization: Marquette Univ., Milwaukee
• OSTI ID: 7290298
• Journal Information: J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 16:1-2; ISSN JSSCB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
CHEMICAL COMPOSITION
CRYSTAL DOPING
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
IONIC CONDUCTIVITY
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
QUANTITY RATIO
RARE EARTH COMPOUNDS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
THERMODYNAMIC PROPERTIES