Electrical properties of p-type electronic defects in the protonic conductor SrCe{sub 0.95}Eu{sub 0.05}O{sub 3-episilon}.

Journal Article · Sun Jun 01 04:00:00 EDT 2003 · J. Electrochem. Soc.

DOI:https://doi.org/10.1149/1.1574031· OSTI ID:949616

Song, S -J; Wachsman, E D; Dorris, S E; Balachandran, U

The electrical properties of SrCe{sub 0.95}Eu{sub 0.05}O{sub 3-{delta}} were studied as a function of both oxygen partial pressure and water vapor partial pressure in the temperature range of 500-800 C, and the partial conductivities of protons, holes, and oxygen vacancies were calculated from the proposed defect model. P-type conduction was dominant in an oxidative atmosphere. It was shown that, in a wet atmosphere, SrCe{sub 0.95}Eu{sub 0.05}O{sub 3-{delta}} is a mixed conductor of protons, holes, and oxygen ions. A conduction transition from protons to holes and/or oxygen ions was found as temperature increased. The calculated activation energy of oxygen ion transport was 0.67 eV; standard solution enthalpy of water dissolution was -164 kJ/mole, which is larger than that of SrCe{sub 0.95}Eu{sub 0.05}O{sub 3-{delta}}. The effect of dopants on the conduction mechanism is explained by a hopping mechanism.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: NETL
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 949616
• Report Number(s): ANL/ET/JA-42558
• Journal Information: J. Electrochem. Soc., Journal Name: J. Electrochem. Soc. Journal Issue: 6 ; Jun. 2003 Vol. 150; ISSN JESOAN; ISSN 0013-4651
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
74 ATOMIC AND MOLECULAR PHYSICS
ACTIVATION ENERGY
DEFECTS
DISSOLUTION
ELECTRICAL PROPERTIES
ENTHALPY
OXYGEN
OXYGEN IONS
PARTIAL PRESSURE
PROTONS
TRANSPORT
VACANCIES
WATER
WATER VAPOR