Positive temperature coefficient and high Seebeck coefficient in ZnO-P2O5/Co composites
Identifieur interne : 000015 ( Maroc/Analysis ); précédent : 000014; suivant : 000016Positive temperature coefficient and high Seebeck coefficient in ZnO-P2O5/Co composites
Auteurs : O. Oabi [Maroc] ; A. Maaroufi [Maroc] ; B. Lucas [France] ; S. Degot [France] ; A. El Amrani [Maroc]Source :
- Journal of non-crystalline solids [ 0022-3093 ] ; 2014.
Descripteurs français
- Pascal (Inist)
- Coefficient température, Effet Seebeck, Propriété électrique, Phosphate de zinc, Phosphate de cobalt, Mesure électrique, Conductivité électrique, Cobalt, Transition phase, Percolation, Système multiphase, Mesure conductivité électrique, Dépendance température, Température transition, Matériau composite, Verre, Expansion volume, Propriété thermique, Petit polaron, Haute température, Conduction saut, ZnO, P2O5, 8105K, 6540D, 7138, 7220E.
- Wicri :
- topic : Cobalt, Matériau composite, Verre.
English descriptors
- KwdEn :
- Cobalt, Cobalt phosphate, Composite materials, Electrical conductivity, Electrical conductivity measurement, Electrical measurement, Electrical properties, Glass, High temperature, Hopping conduction, Multiphase system, Percolation, Phase transitions, Seebeck effect, Small polaron, Temperature coefficient, Temperature dependence, Thermal properties, Transition temperature, Volume expansion, Zinc phosphate.
Abstract
This article reports a study of electrical properties of new Zinc Phosphate glass/Cobalt composites (45 mol.% ZnO-55 mol.%P2O5) (ZP/Co). The measurements of electrical conductivity at room temperature as a function of cobalt's concentration showed a non-conducting to conducting phase transition at percolation threshold of 27 vol.%. The Seebeck coefficient obtained under the same conditions, accompanies a sign, with high positive and negative values below and above the percolation threshold respectively, depicting a p- to n-type conducting phase transition, confirming the conductivity measurements. Then, the measurements of electrical conductivity and Seebeck coefficient above the percolation threshold as a function of temperature showed an original conducting to insulating phase transition, called Positive Temperature Coefficient (PTC) at T = 420 K, associated to a high negative value of S ≤ - 8000 μV/K, with the highest power factor PF = σS2≃ 8 x 10-3 W m-1 K-2. The thermal measurements of volume expansion confirm this transition, indicating matrix dilation around this temperature. However, the thermal behavior of the electrical conductivity and Seebeck coefficient data obtained below the percolation threshold showed different mechanisms i.e.; Small Polaron Hopping (SPH) mechanism at high temperatures and Mott's Variable Range Hopping (VRH) at low temperatures.
Affiliations:
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Pascal:14-0105766Le document en format XML
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Oabi</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>University of Mohammed V Agdal, Laboratory of Composite Materials, Polymers and Environment, Department of Chemistry, Faculty of Sciences P.B. 1014</s1><s2>Rabat- Agdal</s2><s3>MAR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Maroc</country><wicri:noRegion>Rabat- Agdal</wicri:noRegion></affiliation></author><author><name sortKey="Maaroufi, A" sort="Maaroufi, A" uniqKey="Maaroufi A" first="A." last="Maaroufi">A. Maaroufi</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>University of Mohammed V Agdal, Laboratory of Composite Materials, Polymers and Environment, Department of Chemistry, Faculty of Sciences P.B. 1014</s1><s2>Rabat- Agdal</s2><s3>MAR</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Maroc</country><wicri:noRegion>Rabat- Agdal</wicri:noRegion></affiliation></author><author><name sortKey="Lucas, B" sort="Lucas, B" uniqKey="Lucas B" first="B." last="Lucas">B. Lucas</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>XUM UMR 7252 - Université de Limoges/CNRS 123 avenue Albert Thomas</s1><s2>87060 Limoges</s2><s3>FRA</s3><sZ>3 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Nouvelle-Aquitaine</region><region type="old region" nuts="2">Limousin</region><settlement type="city">Limoges</settlement></placeName></affiliation></author><author><name sortKey="Degot, S" sort="Degot, S" uniqKey="Degot S" first="S." last="Degot">S. Degot</name><affiliation wicri:level="3"><inist:fA14 i1="03"><s1>SPCTS, CNRS UMR 6638, European Ceramic Center, 12, rue Atlantis</s1><s2>87068 Limoges</s2><s3>FRA</s3><sZ>4 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Nouvelle-Aquitaine</region><region type="old region" nuts="2">Limousin</region><settlement type="city">Limoges</settlement></placeName></affiliation></author><author><name sortKey="El Amrani, A" sort="El Amrani, A" uniqKey="El Amrani A" first="A." last="El Amrani">A. El Amrani</name><affiliation wicri:level="1"><inist:fA14 i1="04"><s1>LPSMS, FST Errachidia, University Moulay Ismail Meknès. B. P. 509</s1><s2>Boutalamine, Errachidia</s2><s3>MAR</s3><sZ>5 aut.</sZ></inist:fA14><country>Maroc</country><wicri:noRegion>Boutalamine, Errachidia</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Journal of non-crystalline solids</title><title level="j" type="abbreviated">J. non-cryst. solids</title><idno type="ISSN">0022-3093</idno><imprint><date when="2014">2014</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of non-crystalline solids</title><title level="j" type="abbreviated">J. non-cryst. solids</title><idno type="ISSN">0022-3093</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Cobalt</term><term>Cobalt phosphate</term><term>Composite materials</term><term>Electrical conductivity</term><term>Electrical conductivity measurement</term><term>Electrical measurement</term><term>Electrical properties</term><term>Glass</term><term>High temperature</term><term>Hopping conduction</term><term>Multiphase system</term><term>Percolation</term><term>Phase transitions</term><term>Seebeck effect</term><term>Small polaron</term><term>Temperature coefficient</term><term>Temperature dependence</term><term>Thermal properties</term><term>Transition temperature</term><term>Volume expansion</term><term>Zinc phosphate</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Coefficient température</term><term>Effet Seebeck</term><term>Propriété électrique</term><term>Phosphate de zinc</term><term>Phosphate de cobalt</term><term>Mesure électrique</term><term>Conductivité électrique</term><term>Cobalt</term><term>Transition phase</term><term>Percolation</term><term>Système multiphase</term><term>Mesure conductivité électrique</term><term>Dépendance température</term><term>Température transition</term><term>Matériau composite</term><term>Verre</term><term>Expansion volume</term><term>Propriété thermique</term><term>Petit polaron</term><term>Haute température</term><term>Conduction saut</term><term>ZnO</term><term>P2O5</term><term>8105K</term><term>6540D</term><term>7138</term><term>7220E</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Cobalt</term><term>Matériau composite</term><term>Verre</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">This article reports a study of electrical properties of new Zinc Phosphate glass/Cobalt composites (45 mol.% ZnO-55 mol.%P<sub>2</sub>O<sub>5</sub>) (ZP/Co). The measurements of electrical conductivity at room temperature as a function of cobalt's concentration showed a non-conducting to conducting phase transition at percolation threshold of 27 vol.%. The Seebeck coefficient obtained under the same conditions, accompanies a sign, with high positive and negative values below and above the percolation threshold respectively, depicting a p- to n-type conducting phase transition, confirming the conductivity measurements. Then, the measurements of electrical conductivity and Seebeck coefficient above the percolation threshold as a function of temperature showed an original conducting to insulating phase transition, called Positive Temperature Coefficient (PTC) at T = 420 K, associated to a high negative value of S ≤ - 8000 μV/K, with the highest power factor PF = σS<sup>2</sup>≃ 8 x 10<sup>-</sup>3 W m<sup>-</sup>1 K<sup>-</sup>2. The thermal measurements of volume expansion confirm this transition, indicating matrix dilation around this temperature. However, the thermal behavior of the electrical conductivity and Seebeck coefficient data obtained below the percolation threshold showed different mechanisms i.e.; Small Polaron Hopping (SPH) mechanism at high temperatures and Mott's Variable Range Hopping (VRH) at low temperatures.</div></front></TEI><affiliations><list><country><li>France</li><li>Maroc</li></country><region><li>Limousin</li><li>Nouvelle-Aquitaine</li></region><settlement><li>Limoges</li></settlement></list><tree><country name="Maroc"><noRegion><name sortKey="Oabi, O" sort="Oabi, O" uniqKey="Oabi O" first="O." last="Oabi">O. Oabi</name></noRegion><name sortKey="El Amrani, A" sort="El Amrani, A" uniqKey="El Amrani A" first="A." last="El Amrani">A. El Amrani</name><name sortKey="Maaroufi, A" sort="Maaroufi, A" uniqKey="Maaroufi A" first="A." last="Maaroufi">A. Maaroufi</name></country><country name="France"><region name="Nouvelle-Aquitaine"><name sortKey="Lucas, B" sort="Lucas, B" uniqKey="Lucas B" first="B." last="Lucas">B. Lucas</name></region><name sortKey="Degot, S" sort="Degot, S" uniqKey="Degot S" first="S." last="Degot">S. Degot</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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