IndiumV3, Russie, Analysis, bibRecord, 000E04

Dielectric spectra and Vogel-Fulcher scaling in Pb(In0.5Nb0.5)O3 relaxor ferroelectric

Identifieur interne : 000E04 ( Russie/Analysis ); précédent : 000E03; suivant : 000E05

Dielectric spectra and Vogel-Fulcher scaling in Pb(In0.5Nb0.5)O3 relaxor ferroelectric

Auteurs : RBID : Pascal:99-0358492

Descripteurs français

Pascal (Inist)
- Dispersion diélectrique, Dépendance fréquence, Constante diélectrique, Modèle phénoménologique, Relaxation diélectrique, Temps relaxation, Dépendance température, Système désordonné, Structure verre, Relation structure propriété, Relaxeur, Matériau ferroélectrique, Plomb oxyde, Indium oxyde, Niobium oxyde, Etude expérimentale, Composé quaternaire, 7722G, Pb(In0,5Nb0,5)O3, In Nb O Pb.

English descriptors

KwdEn :
- Dielectric dispersion, Dielectric relaxation, Disordered systems, Experimental study, Ferroelectric materials, Frequency dependence, Glass structure, Indium oxides, Lead oxides, Niobium oxides, Permittivity, Phenomenological model, Property structure relationship, Quaternary compounds, Relaxation time, Relaxor, Temperature dependence.

Abstract

Dielectric dispersion in disordered Pb(In_0.5Nb_0.5)O₃ crystals was studied. Two dispersion regions were found at 10³-10⁵ Hz and 10⁸-10⁹ Hz at room temperature. The low-frequency relaxation process, which has a very wide distribution of relaxation times, shifts to higher frequency (up to about 10⁹ Hz) and becomes narrower in frequency with increasing temperature. It is this relaxation process that is responsible for the temperature shift of the diffused ε(T) maximum with increasing frequency. At low frequencies (f < 10⁶ Hz) the temperatures of ε' and ε' maxima follow the Vogel-Fulcher law and the entire ε" data set can be scaled using a scaling variable related to frequency by the Vogel-Fulcher law. At f > 10⁶ Hz the Vogel-Fulcher law and scaling are also valid, but with different fitting parameters. The results can be described in terms of a phenomenological model implying a wide and smooth spectrum of relaxation times which broadens with decreasing temperature rather than be explained by freezing into the glass state.

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Pascal:99-0358492

Le document en format XML

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Nb<sub>0.5</sub>
)O<sub>3</sub>
 relaxor ferroelectric</title>
<author><name sortKey="Bokov, A A" uniqKey="Bokov A">A. A. Bokov</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Institute of Physics, Rostov State University, 194 Stachki Avenue</s1>
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<country>Russie</country>
<wicri:noRegion>Rostov-on-Don 344090</wicri:noRegion>
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<author><name sortKey="Leshchenko, M A" uniqKey="Leshchenko M">M. A. Leshchenko</name>
<affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Microelectronics Department, Kiev Polytechnic Institute, 37 Pobedi Avenue</s1>
<s2>Kiev 252056</s2>
<s3>UKR</s3>
<sZ>2 aut.</sZ>
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<country>Ukraine</country>
<wicri:noRegion>Kiev 252056</wicri:noRegion>
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<author><name sortKey="Malitskaya, M A" uniqKey="Malitskaya M">M. A. Malitskaya</name>
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<s2>Rostov-on-Don 344090</s2>
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<country>Russie</country>
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<author><name sortKey="Raevski, I P" uniqKey="Raevski I">I. P. Raevski</name>
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<publicationStmt><idno type="inist">99-0358492</idno>
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<seriesStmt><idno type="ISSN">0953-8984</idno>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Dielectric dispersion</term>
<term>Dielectric relaxation</term>
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<term>Experimental study</term>
<term>Ferroelectric materials</term>
<term>Frequency dependence</term>
<term>Glass structure</term>
<term>Indium oxides</term>
<term>Lead oxides</term>
<term>Niobium oxides</term>
<term>Permittivity</term>
<term>Phenomenological model</term>
<term>Property structure relationship</term>
<term>Quaternary compounds</term>
<term>Relaxation time</term>
<term>Relaxor</term>
<term>Temperature dependence</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Dispersion diélectrique</term>
<term>Dépendance fréquence</term>
<term>Constante diélectrique</term>
<term>Modèle phénoménologique</term>
<term>Relaxation diélectrique</term>
<term>Temps relaxation</term>
<term>Dépendance température</term>
<term>Système désordonné</term>
<term>Structure verre</term>
<term>Relation structure propriété</term>
<term>Relaxeur</term>
<term>Matériau ferroélectrique</term>
<term>Plomb oxyde</term>
<term>Indium oxyde</term>
<term>Niobium oxyde</term>
<term>Etude expérimentale</term>
<term>Composé quaternaire</term>
<term>7722G</term>
<term>Pb(In0,5Nb0,5)O3</term>
<term>In Nb O Pb</term>
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<front><div type="abstract" xml:lang="en">Dielectric dispersion in disordered Pb(In<sub>0.5</sub>
Nb<sub>0.5</sub>
)O<sub>3</sub>
 crystals was studied. Two dispersion regions were found at 10<sup>3</sup>
-10<sup>5</sup>
 Hz and 10<sup>8</sup>
-10<sup>9</sup>
 Hz at room temperature. The low-frequency relaxation process, which has a very wide distribution of relaxation times, shifts to higher frequency (up to about 10<sup>9</sup>
 Hz) and becomes narrower in frequency with increasing temperature. It is this relaxation process that is responsible for the temperature shift of the diffused ε(T) maximum with increasing frequency. At low frequencies (f < 10<sup>6</sup>
 Hz) the temperatures of ε' and ε' maxima follow the Vogel-Fulcher law and the entire ε" data set can be scaled using a scaling variable related to frequency by the Vogel-Fulcher law. At f > 10<sup>6</sup>
 Hz the Vogel-Fulcher law and scaling are also valid, but with different fitting parameters. The results can be described in terms of a phenomenological model implying a wide and smooth spectrum of relaxation times which broadens with decreasing temperature rather than be explained by freezing into the glass state.</div>
</front>
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<fA08 i1="01" i2="1" l="ENG"><s1>Dielectric spectra and Vogel-Fulcher scaling in Pb(In<sub>0.5</sub>
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 relaxor ferroelectric</s1>
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<fC01 i1="01" l="ENG"><s0>Dielectric dispersion in disordered Pb(In<sub>0.5</sub>
Nb<sub>0.5</sub>
)O<sub>3</sub>
 crystals was studied. Two dispersion regions were found at 10<sup>3</sup>
-10<sup>5</sup>
 Hz and 10<sup>8</sup>
-10<sup>9</sup>
 Hz at room temperature. The low-frequency relaxation process, which has a very wide distribution of relaxation times, shifts to higher frequency (up to about 10<sup>9</sup>
 Hz) and becomes narrower in frequency with increasing temperature. It is this relaxation process that is responsible for the temperature shift of the diffused ε(T) maximum with increasing frequency. At low frequencies (f < 10<sup>6</sup>
 Hz) the temperatures of ε' and ε' maxima follow the Vogel-Fulcher law and the entire ε" data set can be scaled using a scaling variable related to frequency by the Vogel-Fulcher law. At f > 10<sup>6</sup>
 Hz the Vogel-Fulcher law and scaling are also valid, but with different fitting parameters. The results can be described in terms of a phenomenological model implying a wide and smooth spectrum of relaxation times which broadens with decreasing temperature rather than be explained by freezing into the glass state.</s0>
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Dielectric spectra and Vogel-Fulcher scaling in Pb(In0.5Nb0.5)O3 relaxor ferroelectric

Dielectric spectra and Vogel-Fulcher scaling in Pb(In0.5Nb0.5)O3 relaxor ferroelectric

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri