Origin of the colossal permittivity of (Nb plus In) co-doped rutile ceramics by wide-range dielectric spectroscopy

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F18%3A00498094" target="_blank" >RIV/68378271:_____/18:00498094 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1080/01411594.2018.1501801" target="_blank" >http://dx.doi.org/10.1080/01411594.2018.1501801</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1080/01411594.2018.1501801" target="_blank" >10.1080/01411594.2018.1501801</a>

Result language
angličtina
Original language name
Origin of the colossal permittivity of (Nb plus In) co-doped rutile ceramics by wide-range dielectric spectroscopy
Original language description
Searching for giant dipolar defects, suggested as the explanation of the colossal permittivity (CP) in (Nb + In) co-doped rutile, we have recently published temperature-dependent dielectric spectra from sub-Hz to THz range (including 4-point DC conductivity) of several (Nb + In) co-doped rutile ceramics. Using the model of two leaky capacitor in series below ∼1 MHz, we estimated the depletion layer thickness and conductivity. The spectra below ∼10 GHz were fitted with two Cole–Cole relaxations obeying the Arrhenius law, assigned to the effect of depletion layers and grain boundaries. In this paper, using effective medium models, we have for the first time modelled the spectra as a composite of semiconducting grains and substantially less-conducting grain boundaries and near-electrode depletion layers. The CP effect has been fully explained by the combination of surface and internal barrier-layer capacitor effects, without any measurable contribution from the dipolar defects.n
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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