Enhanced extrinsic dielectric response of TiO2 modified CaCu3Ti4O12 ceramics
Source abstract
Abstract
Abstract TiO 2 modified CaCu 3 Ti 4 O 12 (CCTO) has been synthesized via a facile sol–gel precipitation process followed by solid state sintering. The influence of the precipitated TiO 2 crystallites on the microstructure, phase composition, and dielectric properties of CCTO has been investigated. The morphology and chemistry of grain boundaries in CCTO ceramics can be significantly tailored by the initial TiO 2 crystallites, which results in enhanced barrier layer capacitor structures. The formation mechanism of barrier layers based on the instability of Cu ions has been discussed. A new bimodal brick layer mechanism has been proposed to explain the effect of TiO 2 modification. The optimized TiO 2 modified CCTO sample exhibits stable dielectric permittivity which is twice as high as the unmodified one, and shows relatively low dielectric loss over the frequency range from 10 2 to 10 5 Hz. Such enhancement is deemed to arise from the modified and bimodal internal barrier layer capacitor effect.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Dielectric properties of ceramics · Ferroelectric and Piezoelectric Materials · Dielectric materials and actuators
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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