Grain size independence of giant dielectric permittivity of CaCu3Ti4−xScxO12 ceramics
Source abstract
Abstract
Abstract The dielectric and electrical properties of CaCu3Ti4−xScxO12 (x=0, 0.04, 0.08, and 0.20) ceramics prepared by a solid-state reaction method were investigated. Grain sizes of CaCu3Ti4O12 were greatly reduced by doping with Sc3+. Surprisingly, the dielectric constant of CaCu3Ti4−xScxO12 ceramics with x=0−0.08 largely increased as the mean grain size decreased. This behavior was extremely hard to produce in CaCu3Ti4O12 ceramics. The nonlinear current−voltage properties CaCu3Ti4−xScxO12 ceramics were significantly degraded. The grain boundary (GB) resistance decreased with increasing Sc3+ concentration even though the density of GB layer increased. This resulted in enhancement of a low-frequency loss tangent due to increased dc conduction. Substitution of some Sc3+ ions into Cu sites was proposed as the cause of reduction of the potential barrier height at GBs. The possible mechanisms of giant dielectric response in CaCu3Ti4O12 ceramics are discussed.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Dielectric properties of ceramics · Ferroelectric and Piezoelectric Materials · Multiferroics and related materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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