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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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

Název v anglickém jazyce

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

Popis výsledku anglicky

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

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Phase Transitions

ISSN

0141-1594

e-ISSN

—

Svazek periodika

91

Číslo periodika v rámci svazku

9-10

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

10

Strana od-do

932-941

Kód UT WoS článku

000446595600003

EID výsledku v databázi Scopus

2-s2.0-85050338353