Electrical conductivity in strontium titanate with nonideal cationic ratio

Journal Article · Sat May 01 04:00:00 EDT 1982 · J. Solid State Chem.; (United States)

DOI:https://doi.org/10.1016/0022-4596(82)90002-0· OSTI ID:6722361

Eror, N G; Balachandran, U

The electrical conductivity of polycrystalline strontium titanate with (Sr/Ti) = 0.996, 0.99, and 0.98 was determined for the oxygen partial pressure range of 10/sup 0/ to 10/sup -22/ atm and the temperature range of 850-1050/sup 0/C. These data were found to be similar to that obtained for the sample with ideal cationic ratio. The observed data were proportional to the -1/6 power of oxygen partial pressure for P/sub O/sub 2// < 10/sup -15/ atm, proportional to P/sup -1///sup 4//sub O/sub 2// for the pressure range 10/sup -8/ - 10/sup -15/ atm, and proportional to P/sub O/sub 2///sup +1///sup 4/ for P/sub O/sub 2// > 10/sup -4/ atm. The deviation from the ideal Sr-to-Ti ratio was found to be accommodated by neutral vacancy pairs, (V''/sub Sr/ V/sub O//sup ../). The results indicate that the single-phase field of strontium titanate extends beyond 50.505 mole% TiO/sub 2/ at elevated temperatures.

• Research Organization: Oregon Graduate Center, Beaverton
• OSTI ID: 6722361
• Journal Information: J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Vol. 42:3; ISSN JSSCB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALKALINE EARTH METAL COMPOUNDS
CATIONS
CHARGED PARTICLES
CHEMICAL REACTIONS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DATA
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ENTHALPY
EQUATIONS
EXPERIMENTAL DATA
INFORMATION
IONS
NUMERICAL DATA
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POINT DEFECTS
PRESSURE DEPENDENCE
QUANTITY RATIO
STRONTIUM COMPOUNDS
STRONTIUM TITANATES
THERMODYNAMIC PROPERTIES
TITANATES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
VACANCIES
VERY HIGH TEMPERATURE