Intrinsic and extrinsic relaxation of CaCu{sub 3}Ti{sub 4}O{sub 12} ceramics: Effect of sintering

Journal Article · Mon Nov 15 00:00:00 EST 2010 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3511444· OSTI ID:21537940

Li, J Y; Zhao, X T; Li, S T ^[1]; Alim, Mohammad A ^[2]

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1. State Key Laboratory of Electrical Insulation and Power Equipment, Xi'an Jiaotong University, 28 Xianning West Road, Xi'an, Shaanxi 710049 (China)
2. Department of Electrical Engineering, Alabama A and M University, P.O. Box 297, Huntsville, Alabama 35762 (United States)

The effect of sintering process on the electrical properties of CaCu{sub 3}Ti{sub 4}O{sub 12} (CCTO) ceramic dielectrics were investigated in this paper. It was found that grain size is affected by sintering and the nonlinear current-voltage (I-V) property will decrease with the increased sintering time. Also, the frequency and temperature dependences of dielectric permittivity and loss in the ranges of 10{sup -1}-10{sup 7} Hz and 130-270 K were studied. Two relaxation processes with activation energy of 0.51 eV and 0.10 eV, respectively, were found in the frequency dependence of tan {delta} and Cole-Cole planes, which can be interpreted in terms of insulating grain boundaries and semiconducting grains. It was suggested that grain boundary Maxwell-Wagner relaxation and ionization of oxygen vacancy V{sub O}{sup ++}, proposed as extrinsic and intrinsic relaxations, are responsible for the dielectric behaviors of CCTO ceramics.

• OSTI ID: 21537940
• Journal Information: Journal of Applied Physics, Vol. 108, Issue 10; Other Information: DOI: 10.1063/1.3511444; (c) 2010 American Institute of Physics; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACTIVATION ENERGY
CALCIUM COMPOUNDS
CERAMICS
COPPER COMPOUNDS
DIELECTRIC MATERIALS
ELECTRIC CONDUCTIVITY
ELECTRIC POTENTIAL
ELECTRICAL PROPERTIES
FREQUENCY DEPENDENCE
GRAIN BOUNDARIES
GRAIN SIZE
IONIZATION
NONLINEAR PROBLEMS
PERMITTIVITY
RELAXATION
SINTERING
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0065-0273 K
TITANATES
ALKALINE EARTH METAL COMPOUNDS
DIELECTRIC PROPERTIES
ENERGY
FABRICATION
MATERIALS
MICROSTRUCTURE
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SIZE
TEMPERATURE RANGE
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS