Characterization of internal boundary layer capacitors based upon barium titanate and strontium titanate
- Univ. of Illinois, Urbana-Champaign, IL (United States)
The nature of ceramic microstructure and the electrical properties of individual grains and junctions was determined by STEM, microprobe analysis and microscale electrical measurements. The chemical compositions of the resistive boundary regions were different from those of the grains. Additives were concentrated in the boundary regions, forming resistive layers. Limited diffusion of the counterdopants into the grain subsurface formed an interfacial compensation layer between the insulating intergranular layer and the semiconducting grains. The electrical behavior of this intermediate layer was found to be similar to that of a depletion layer. Ceramic microstructures were approximated by a three-layer n-c-i-c-n model and representive equivalent circuit, which was used to explain the voltage dependence of the dielectric constant and dispersion behavior. Calculated properties were in good agreement with experimental values. Fine grain microstructures developed by liquid phase sintering techniques, were suitable for high dielectric constant multilayer capacitors, based upon internal boundary layer phenomena, and these capacitors had stable dielectric characteristics.
- Research Organization:
- Univ. of Illinois at Urbana-Champaign, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC02-76ER01198
- OSTI ID:
- 6697644
- Report Number(s):
- DOE/ER/01198-1340
- Resource Relation:
- Other Information: Thesis
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
BARIUM COMPOUNDS
ELECTRICAL PROPERTIES
CAPACITORS
STRONTIUM COMPOUNDS
TITANATES
MICROSTRUCTURE
ALKALINE EARTH METAL COMPOUNDS
CRYSTAL STRUCTURE
ELECTRICAL EQUIPMENT
EQUIPMENT
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
420200* - Engineering- Facilities
Equipment
& Techniques