Electrode and grain-boundary effects on the conductivity of CaCu{sub 3}Ti{sub 4}O{sub 12}

Journal Article · Mon Jul 11 00:00:00 EDT 2005 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.1993748· OSTI ID:20702575

Lei, Zhang ^[1]

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1. Center for Materials Chemistry and Department of Chemistry, 136 Fleming Building, University of Houston, Houston, Texas, 77204 (United States)

The ac conductivity of CaCu{sub 3}Ti{sub 4}O{sub 12} (CCTO) ceramics was studied in the temperature range 173<T<443 K. The dc conductivities containing the components of electrodes ({sigma}{sub e}) and grain boundaries ({sigma}{sub gb}) were measured, from which a thermal activation energies of {approx}0.54 eV was inferred. Different behaviors of dielectric relaxations are responsible for the two contributing components.

• OSTI ID: 20702575
• Journal Information: Applied Physics Letters, Vol. 87, Issue 2; Other Information: DOI: 10.1063/1.1993748; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACTIVATION ENERGY
CALCIUM COMPOUNDS
CERAMICS
COPPER COMPOUNDS
DIELECTRIC MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRODES
GRAIN BOUNDARIES
MILLI EV RANGE
RELAXATION
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TITANATES