AustralieFrV1, Istex, Corpus, bibRecord, 002462

Thermopower and electrical conductivity of single crystal and polycrystalline CoO

Identifieur interne : 002462 ( Istex/Corpus ); précédent : 002461; suivant : 002463

Thermopower and electrical conductivity of single crystal and polycrystalline CoO

Auteurs : G. Borchardt ; K. Kowalski ; J. Nowotny ; M. Rekas ; W. Weppner

Source :

Journal of the European Ceramic Society [ 0955-2219 ] ; 1994.

RBID : ISTEX:C53E57B733C83A7A3C81A64FEC0C6065511F7D46

English descriptors

KwdEn :
- Activation energy, Aliovalent impurities, Band model, Bulk phase, Ceramic material, Chem, Chemical diffusion, Chemical diffusion coefficient, Comparative studies, Conductivity, Defect, Defect structure, Electrical conductivity, Electrical properties, Electron holes, Electron holes increases, Elektrischen leitfgihigkeit, Equilibration kinetics, Experimental data, Grain boundaries, Grain boundary region, Ideal defect model, Ideal model, Ionization degree, Mobility term, Neue folge, Nonstoichiometric compounds, Nonstoichiometry, Nowotny, Other hand, Oxide composition, Oxide nonstoichiometry, Oxygen activity, Oxygen pressure exponent, Phys, Plenum press, Polaron, Polycrystalline, Polycrystalline specimen, Polycrystalline specimens, Present work, Previous studies, Single crystal, Single crystals, Small polaron mechanism, Strong interactions, Substantial effect, Temperature range, Thermopower, Transport properties.
Teeft :
- Activation energy, Aliovalent impurities, Band model, Bulk phase, Ceramic material, Chem, Chemical diffusion, Chemical diffusion coefficient, Comparative studies, Conductivity, Defect, Defect structure, Electrical conductivity, Electrical properties, Electron holes, Electron holes increases, Elektrischen leitfgihigkeit, Equilibration kinetics, Experimental data, Grain boundaries, Grain boundary region, Ideal defect model, Ideal model, Ionization degree, Mobility term, Neue folge, Nonstoichiometric compounds, Nonstoichiometry, Nowotny, Other hand, Oxide composition, Oxide nonstoichiometry, Oxygen activity, Oxygen pressure exponent, Phys, Plenum press, Polaron, Polycrystalline, Polycrystalline specimen, Polycrystalline specimens, Present work, Previous studies, Single crystal, Single crystals, Small polaron mechanism, Strong interactions, Substantial effect, Temperature range, Thermopower, Transport properties.

Abstract

Abstract: Comparative studies of both electrical conductivity and thermopower (Seebeck effect) were carried out for undoped Co1z.sbnd;yO involving both single crystal and polycrystalline specimens within the temperature range 1223–1473 K and under oxygen partial pressure range 10–105 Pa.It was observed that the reciprocal of oxygen pressure exponent determined by thermopower (nα) and electrical conductivity (nσ) for both single crystal and polycrystalline CoO increases with temperature. The parameter nα assumes much higher values than nσ for both specimens.The mobility of electron holes increases with non-stoichiometry (y) for both the single crystal and the polycrystalline specimen.Based on the electrical conductivity data on temperatures it was concluded that conduction in CoO occurs according to the hopping model rather than the band model.The effect of p(O2) on the exponent of the oxygen pressure dependence have been considered in terms of interactions between the defects in this region.

Url:

https://api.istex.fr/document/C53E57B733C83A7A3C81A64FEC0C6065511F7D46/fulltext/pdf

DOI: 10.1016/0955-2219(94)90074-4

Links to Exploration step

ISTEX:C53E57B733C83A7A3C81A64FEC0C6065511F7D46

Le document en format XML

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<front><div type="abstract" xml:lang="en">Abstract: Comparative studies of both electrical conductivity and thermopower (Seebeck effect) were carried out for undoped Co1z.sbnd;yO involving both single crystal and polycrystalline specimens within the temperature range 1223–1473 K and under oxygen partial pressure range 10–105 Pa.It was observed that the reciprocal of oxygen pressure exponent determined by thermopower (nα) and electrical conductivity (nσ) for both single crystal and polycrystalline CoO increases with temperature. The parameter nα assumes much higher values than nσ for both specimens.The mobility of electron holes increases with non-stoichiometry (y) for both the single crystal and the polycrystalline specimen.Based on the electrical conductivity data on temperatures it was concluded that conduction in CoO occurs according to the hopping model rather than the band model.The effect of p(O2) on the exponent of the oxygen pressure dependence have been considered in terms of interactions between the defects in this region.</div>
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<abstract xml:lang="en"><p>Comparative studies of both electrical conductivity and thermopower (Seebeck effect) were carried out for undoped Co1z.sbnd;yO involving both single crystal and polycrystalline specimens within the temperature range 1223–1473 K and under oxygen partial pressure range 10–105 Pa.It was observed that the reciprocal of oxygen pressure exponent determined by thermopower (nα) and electrical conductivity (nσ) for both single crystal and polycrystalline CoO increases with temperature. The parameter nα assumes much higher values than nσ for both specimens.The mobility of electron holes increases with non-stoichiometry (y) for both the single crystal and the polycrystalline specimen.Based on the electrical conductivity data on temperatures it was concluded that conduction in CoO occurs according to the hopping model rather than the band model.The effect of p(O2) on the exponent of the oxygen pressure dependence have been considered in terms of interactions between the defects in this region.</p>
</abstract>
<abstract xml:lang="de"><p>Zusammenfassung: Die elektrische Leitfähigkeit und die Thermokraft (Seebeck-Effekt) von undotierten Co1z.sbnd;yOEin- und Vielkristallproben wurden für den Temperaturbereich 1223–1473 K bei einem Sauerstoffpartialdruck zwischen 10–105 Pa untersucht.Dabei zeigte sich, daß der Kehrwert des Sauerstoffdruckexponenten, bestimmt aus der Thermokraft (nα) und der elektrischen Leitfähigkeit (nσ), sowohl für CoOEin- als auch für CoO-Vielkristallproben mit der Temperatur zunimmt. Für beide Probenarten erreicht der Parameter nα wesentlich höhere Werte als nσ.Die Mobilität der Elektronenfehlstellen nimmt mit der Nichtstöchiometrie (y) sowohl für Ein- als auch für Vielkristallproben zu.Augrund der Variation der elektrischen Leitfähigkeit mit der Temperatur wurde geschlossen, daß die Leitfähigkeit in CoO entsprechend dem ‘hopping’ Modell und nicht dem ‘band’ Modell erfolgt.Der Effekt von p(O2) auf den Exponenten des Sauerstoffdruckes wurde bezüglich der Wechselwirkung zwischen den Defekten diskutiert.</p>
</abstract>
<abstract xml:lang="fr"><p>Résumé: Nous avons procédé à une étude comparative d'échantillons mono et polycristallins de Co1z.sbnd;yO, non dopés, du point de vue de la conductivitéélectrique et du comportement thermoélectrique (effect Seebeck), dans la gamme de températures 1223–1473 K et sous une pression partielle d'oxygène variant de 10 à 105 Pa.Nous avons observé que l'inverse de l'exposant de la pression d'oxygène, déterminé par la constante thermoélectrique (nα) et la conductivité électrique (nσ) pour les échantillons monocristallins ou polycristallins augmente avec la température. Le paramètre nα suppose des valeurs plus élevées que le paramètre nσ ceci pour les deux types d'échantillons.La mobilité des trous d'électrons augmente avec l'écart à la stoechiométrie (y) pour les deux catégories.La variation de la conductivité avec la température nous conduit à penser que la conduction dans CoO est une conduction par sauts plutôt qu'une conduction de bande.L'effet de p(O2) sur la mobilité des trous, aussi bien que sur l'exposant de la variation de la pression d'oxygène est examiné en termes des interactions entre les défauts.</p>
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<head><ce:title>Thermopower and electrical conductivity of single crystal and polycrystalline CoO</ce:title>
<ce:author-group><ce:author><ce:given-name>G.</ce:given-name>
<ce:surname>Borchardt</ce:surname>
<ce:cross-ref refid="AFF1"><ce:sup>a</ce:sup>
</ce:cross-ref>
</ce:author>
<ce:author><ce:given-name>K.</ce:given-name>
<ce:surname>Kowalski</ce:surname>
<ce:cross-ref refid="AFF2"><ce:sup>b</ce:sup>
</ce:cross-ref>
</ce:author>
<ce:author><ce:given-name>J.</ce:given-name>
<ce:surname>Nowotny</ce:surname>
<ce:cross-ref refid="COR1"><ce:sup>∗</ce:sup>
</ce:cross-ref>
<ce:cross-ref refid="AFF3"><ce:sup>c</ce:sup>
</ce:cross-ref>
</ce:author>
<ce:author><ce:given-name>M.</ce:given-name>
<ce:surname>Rekas</ce:surname>
<ce:cross-ref refid="AFF1"><ce:sup>a</ce:sup>
</ce:cross-ref>
</ce:author>
<ce:author><ce:given-name>W.</ce:given-name>
<ce:surname>Weppner</ce:surname>
<ce:cross-ref refid="AFF4"><ce:sup>d</ce:sup>
</ce:cross-ref>
</ce:author>
<ce:affiliation id="AFF1"><ce:label>a</ce:label>
<ce:textfn>Laboratory of Electronic Materials, Technical University of Clausthal, 3392 Clausthal-Zellerfeld, Germany</ce:textfn>
</ce:affiliation>
<ce:affiliation id="AFF2"><ce:label>b</ce:label>
<ce:textfn>Université Nancy I, Laboratoire de Chimie du Solide Minéral, 54506 Vandoeuvre-les-Nancy Cedex, France</ce:textfn>
</ce:affiliation>
<ce:affiliation id="AFF3"><ce:label>c</ce:label>
<ce:textfn>Australian Nuclear Science & Technology Organisation, Advanced Materials Program, Lucas Heights, NSW 2234, Australia</ce:textfn>
</ce:affiliation>
<ce:affiliation id="AFF4"><ce:label>d</ce:label>
<ce:textfn>Christian Albrechts University, Chair for Sensors and Solid State Ionics, 24098 Kiel, Germany</ce:textfn>
</ce:affiliation>
<ce:correspondence id="COR1"><ce:label>∗</ce:label>
<ce:text>To whom correspondence should be addressed.</ce:text>
</ce:correspondence>
</ce:author-group>
<ce:date-received day="30" month="6" year="1993"></ce:date-received>
<ce:date-accepted day="24" month="4" year="1994"></ce:date-accepted>
<ce:abstract><ce:section-title>Abstract</ce:section-title>
<ce:abstract-sec><ce:simple-para>Comparative studies of both electrical conductivity and thermopower (Seebeck effect) were carried out for undoped Co<ce:inf>1z.sbnd;y</ce:inf>
O involving both single crystal and polycrystalline specimens within the temperature range 1223–1473 K and under oxygen partial pressure range 10–10<ce:sup>5</ce:sup>
 Pa.</ce:simple-para>
<ce:simple-para>It was observed that the reciprocal of oxygen pressure exponent determined by thermopower (n<ce:inf>α</ce:inf>
) and electrical conductivity (n<ce:inf>σ</ce:inf>
) for both single crystal and polycrystalline CoO increases with temperature. The parameter n<ce:inf>α</ce:inf>
 assumes much higher values than n<ce:inf>σ</ce:inf>
 for both specimens.</ce:simple-para>
<ce:simple-para>The mobility of electron holes increases with non-stoichiometry (y) for both the single crystal and the polycrystalline specimen.</ce:simple-para>
<ce:simple-para>Based on the electrical conductivity data on temperatures it was concluded that conduction in CoO occurs according to the hopping model rather than the band model.</ce:simple-para>
<ce:simple-para>The effect of p(O<ce:inf>2</ce:inf>
) on the exponent of the oxygen pressure dependence have been considered in terms of interactions between the defects in this region.</ce:simple-para>
</ce:abstract-sec>
</ce:abstract>
<ce:abstract xml:lang="de"><ce:section-title>Zusammenfassung</ce:section-title>
<ce:abstract-sec><ce:simple-para>Die elektrische Leitfähigkeit und die Thermokraft (Seebeck-Effekt) von undotierten Co<ce:inf>1z.sbnd;y</ce:inf>
OEin- und Vielkristallproben wurden für den Temperaturbereich 1223–1473 K bei einem Sauerstoffpartialdruck zwischen 10–10<ce:sup>5</ce:sup>
 Pa untersucht.</ce:simple-para>
<ce:simple-para>Dabei zeigte sich, daß der Kehrwert des Sauerstoffdruckexponenten, bestimmt aus der Thermokraft (n<ce:inf>α</ce:inf>
) und der elektrischen Leitfähigkeit (n<ce:inf>σ</ce:inf>
), sowohl für CoOEin- als auch für CoO-Vielkristallproben mit der Temperatur zunimmt. Für beide Probenarten erreicht der Parameter n<ce:inf>α</ce:inf>
 wesentlich höhere Werte als n<ce:inf>σ</ce:inf>
.</ce:simple-para>
<ce:simple-para>Die Mobilität der Elektronenfehlstellen nimmt mit der Nichtstöchiometrie (y) sowohl für Ein- als auch für Vielkristallproben zu.</ce:simple-para>
<ce:simple-para>Augrund der Variation der elektrischen Leitfähigkeit mit der Temperatur wurde geschlossen, daß die Leitfähigkeit in CoO entsprechend dem ‘hopping’ Modell und nicht dem ‘band’ Modell erfolgt.</ce:simple-para>
<ce:simple-para>Der Effekt von p(O<ce:inf>2</ce:inf>
) auf den Exponenten des Sauerstoffdruckes wurde bezüglich der Wechselwirkung zwischen den Defekten diskutiert.</ce:simple-para>
</ce:abstract-sec>
</ce:abstract>
<ce:abstract xml:lang="fr"><ce:section-title>Résumé</ce:section-title>
<ce:abstract-sec><ce:simple-para>Nous avons procédé à une étude comparative d'échantillons mono et polycristallins de Co<ce:inf>1z.sbnd;y</ce:inf>
O, non dopés, du point de vue de la conductivitéélectrique et du comportement thermoélectrique (effect Seebeck), dans la gamme de températures 1223–1473 K et sous une pression partielle d'oxygène variant de 10 à 10<ce:sup>5</ce:sup>
 Pa.</ce:simple-para>
<ce:simple-para>Nous avons observé que l'inverse de l'exposant de la pression d'oxygène, déterminé par la constante thermoélectrique (n<ce:inf>α</ce:inf>
) et la conductivité électrique (n<ce:inf>σ</ce:inf>
) pour les échantillons monocristallins ou polycristallins augmente avec la température. Le paramètre n<ce:inf>α</ce:inf>
 suppose des valeurs plus élevées que le paramètre n<ce:inf>σ</ce:inf>
 ceci pour les deux types d'échantillons.</ce:simple-para>
<ce:simple-para>La mobilité des trous d'électrons augmente avec l'écart à la stoechiométrie (y) pour les deux catégories.</ce:simple-para>
<ce:simple-para>La variation de la conductivité avec la température nous conduit à penser que la conduction dans CoO est une conduction par sauts plutôt qu'une conduction de bande.</ce:simple-para>
<ce:simple-para>L'effet de p(O<ce:inf>2</ce:inf>
) sur la mobilité des trous, aussi bien que sur l'exposant de la variation de la pression d'oxygène est examiné en termes des interactions entre les défauts.</ce:simple-para>
</ce:abstract-sec>
</ce:abstract>
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<abstract lang="en">Abstract: Comparative studies of both electrical conductivity and thermopower (Seebeck effect) were carried out for undoped Co1z.sbnd;yO involving both single crystal and polycrystalline specimens within the temperature range 1223–1473 K and under oxygen partial pressure range 10–105 Pa.It was observed that the reciprocal of oxygen pressure exponent determined by thermopower (nα) and electrical conductivity (nσ) for both single crystal and polycrystalline CoO increases with temperature. The parameter nα assumes much higher values than nσ for both specimens.The mobility of electron holes increases with non-stoichiometry (y) for both the single crystal and the polycrystalline specimen.Based on the electrical conductivity data on temperatures it was concluded that conduction in CoO occurs according to the hopping model rather than the band model.The effect of p(O2) on the exponent of the oxygen pressure dependence have been considered in terms of interactions between the defects in this region.</abstract>
<abstract lang="de">Zusammenfassung: Die elektrische Leitfähigkeit und die Thermokraft (Seebeck-Effekt) von undotierten Co1z.sbnd;yOEin- und Vielkristallproben wurden für den Temperaturbereich 1223–1473 K bei einem Sauerstoffpartialdruck zwischen 10–105 Pa untersucht.Dabei zeigte sich, daß der Kehrwert des Sauerstoffdruckexponenten, bestimmt aus der Thermokraft (nα) und der elektrischen Leitfähigkeit (nσ), sowohl für CoOEin- als auch für CoO-Vielkristallproben mit der Temperatur zunimmt. Für beide Probenarten erreicht der Parameter nα wesentlich höhere Werte als nσ.Die Mobilität der Elektronenfehlstellen nimmt mit der Nichtstöchiometrie (y) sowohl für Ein- als auch für Vielkristallproben zu.Augrund der Variation der elektrischen Leitfähigkeit mit der Temperatur wurde geschlossen, daß die Leitfähigkeit in CoO entsprechend dem ‘hopping’ Modell und nicht dem ‘band’ Modell erfolgt.Der Effekt von p(O2) auf den Exponenten des Sauerstoffdruckes wurde bezüglich der Wechselwirkung zwischen den Defekten diskutiert.</abstract>
<abstract lang="fr">Résumé: Nous avons procédé à une étude comparative d'échantillons mono et polycristallins de Co1z.sbnd;yO, non dopés, du point de vue de la conductivitéélectrique et du comportement thermoélectrique (effect Seebeck), dans la gamme de températures 1223–1473 K et sous une pression partielle d'oxygène variant de 10 à 105 Pa.Nous avons observé que l'inverse de l'exposant de la pression d'oxygène, déterminé par la constante thermoélectrique (nα) et la conductivité électrique (nσ) pour les échantillons monocristallins ou polycristallins augmente avec la température. Le paramètre nα suppose des valeurs plus élevées que le paramètre nσ ceci pour les deux types d'échantillons.La mobilité des trous d'électrons augmente avec l'écart à la stoechiométrie (y) pour les deux catégories.La variation de la conductivité avec la température nous conduit à penser que la conduction dans CoO est une conduction par sauts plutôt qu'une conduction de bande.L'effet de p(O2) sur la mobilité des trous, aussi bien que sur l'exposant de la variation de la pression d'oxygène est examiné en termes des interactions entre les défauts.</abstract>
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Thermopower and electrical conductivity of single crystal and polycrystalline CoO

Thermopower and electrical conductivity of single crystal and polycrystalline CoO

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