Positive temperature coefficient and high Seebeck coefficient in ZnO-P2O5/Co composites
Identifieur interne : 000007 ( PascalFrancis/Checkpoint ); précédent : 000006; suivant : 000008Positive 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.
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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><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0022-3093</s0></fA01><fA02 i1="01"><s0>JNCSBJ</s0></fA02><fA03 i2="1"><s0>J. non-cryst. solids</s0></fA03><fA05><s2>385</s2></fA05><fA08 i1="01" i2="1" l="ENG"><s1>Positive temperature coefficient and high Seebeck coefficient in ZnO-P<sub>2</sub>O<sub>5/</sub>Co composites</s1></fA08><fA11 i1="01" i2="1"><s1>OABI (O.)</s1></fA11><fA11 i1="02" i2="1"><s1>MAAROUFI (A.)</s1></fA11><fA11 i1="03" i2="1"><s1>LUCAS (B.)</s1></fA11><fA11 i1="04" i2="1"><s1>DEGOT (S.)</s1></fA11><fA11 i1="05" i2="1"><s1>EL AMRANI (A.)</s1></fA11><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></fA14><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></fA14><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></fA14><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></fA14><fA20><s1>89-94</s1></fA20><fA21><s1>2014</s1></fA21><fA23 i1="01"><s0>ENG</s0></fA23><fA43 i1="01"><s1>INIST</s1><s2>14572</s2><s5>354000501693830120</s5></fA43><fA44><s0>0000</s0><s1>© 2014 INIST-CNRS. All rights reserved.</s1></fA44><fA45><s0>52 ref.</s0></fA45><fA47 i1="01" i2="1"><s0>14-0105766</s0></fA47><fA60><s1>P</s1></fA60><fA61><s0>A</s0></fA61><fA64 i1="01" i2="1"><s0>Journal of non-crystalline solids</s0></fA64><fA66 i1="01"><s0>GBR</s0></fA66><fC01 i1="01" l="ENG"><s0>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.</s0></fC01><fC02 i1="01" i2="3"><s0>001B70A38</s0></fC02><fC02 i1="02" i2="3"><s0>001B70B20E</s0></fC02><fC02 i1="03" i2="3"><s0>001B80A05K</s0></fC02><fC02 i1="04" i2="3"><s0>001B60E40D</s0></fC02><fC03 i1="01" i2="3" l="FRE"><s0>Coefficient température</s0><s5>01</s5></fC03><fC03 i1="01" i2="3" l="ENG"><s0>Temperature coefficient</s0><s5>01</s5></fC03><fC03 i1="02" i2="3" l="FRE"><s0>Effet Seebeck</s0><s5>02</s5></fC03><fC03 i1="02" i2="3" l="ENG"><s0>Seebeck effect</s0><s5>02</s5></fC03><fC03 i1="03" i2="3" l="FRE"><s0>Propriété électrique</s0><s5>03</s5></fC03><fC03 i1="03" i2="3" l="ENG"><s0>Electrical properties</s0><s5>03</s5></fC03><fC03 i1="04" i2="X" l="FRE"><s0>Phosphate de zinc</s0><s5>04</s5></fC03><fC03 i1="04" i2="X" l="ENG"><s0>Zinc phosphate</s0><s5>04</s5></fC03><fC03 i1="04" i2="X" l="SPA"><s0>Zinc fosfato</s0><s5>04</s5></fC03><fC03 i1="05" i2="X" l="FRE"><s0>Phosphate de cobalt</s0><s5>05</s5></fC03><fC03 i1="05" i2="X" l="ENG"><s0>Cobalt phosphate</s0><s5>05</s5></fC03><fC03 i1="05" i2="X" l="SPA"><s0>Cobalto fosfato</s0><s5>05</s5></fC03><fC03 i1="06" i2="X" l="FRE"><s0>Mesure électrique</s0><s5>06</s5></fC03><fC03 i1="06" i2="X" l="ENG"><s0>Electrical measurement</s0><s5>06</s5></fC03><fC03 i1="06" i2="X" l="SPA"><s0>Medida eléctrica</s0><s5>06</s5></fC03><fC03 i1="07" i2="3" l="FRE"><s0>Conductivité électrique</s0><s5>07</s5></fC03><fC03 i1="07" i2="3" l="ENG"><s0>Electrical conductivity</s0><s5>07</s5></fC03><fC03 i1="08" i2="3" l="FRE"><s0>Cobalt</s0><s2>NC</s2><s5>08</s5></fC03><fC03 i1="08" i2="3" l="ENG"><s0>Cobalt</s0><s2>NC</s2><s5>08</s5></fC03><fC03 i1="09" i2="X" l="FRE"><s0>Transition phase</s0><s5>09</s5></fC03><fC03 i1="09" i2="X" l="ENG"><s0>Phase transitions</s0><s5>09</s5></fC03><fC03 i1="09" i2="X" l="SPA"><s0>Transición fase</s0><s5>09</s5></fC03><fC03 i1="10" i2="3" l="FRE"><s0>Percolation</s0><s5>10</s5></fC03><fC03 i1="10" i2="3" l="ENG"><s0>Percolation</s0><s5>10</s5></fC03><fC03 i1="11" i2="X" l="FRE"><s0>Système multiphase</s0><s5>11</s5></fC03><fC03 i1="11" i2="X" l="ENG"><s0>Multiphase system</s0><s5>11</s5></fC03><fC03 i1="11" i2="X" l="SPA"><s0>Sistema multifase</s0><s5>11</s5></fC03><fC03 i1="12" i2="3" l="FRE"><s0>Mesure conductivité électrique</s0><s5>12</s5></fC03><fC03 i1="12" i2="3" l="ENG"><s0>Electrical conductivity measurement</s0><s5>12</s5></fC03><fC03 i1="13" i2="3" l="FRE"><s0>Dépendance température</s0><s5>13</s5></fC03><fC03 i1="13" i2="3" l="ENG"><s0>Temperature dependence</s0><s5>13</s5></fC03><fC03 i1="14" i2="3" l="FRE"><s0>Température transition</s0><s5>14</s5></fC03><fC03 i1="14" i2="3" l="ENG"><s0>Transition temperature</s0><s5>14</s5></fC03><fC03 i1="15" i2="3" l="FRE"><s0>Matériau composite</s0><s5>15</s5></fC03><fC03 i1="15" i2="3" l="ENG"><s0>Composite materials</s0><s5>15</s5></fC03><fC03 i1="16" i2="3" l="FRE"><s0>Verre</s0><s5>16</s5></fC03><fC03 i1="16" i2="3" l="ENG"><s0>Glass</s0><s5>16</s5></fC03><fC03 i1="17" i2="X" l="FRE"><s0>Expansion volume</s0><s5>29</s5></fC03><fC03 i1="17" i2="X" l="ENG"><s0>Volume expansion</s0><s5>29</s5></fC03><fC03 i1="17" i2="X" l="SPA"><s0>Expansión volumen</s0><s5>29</s5></fC03><fC03 i1="18" i2="3" l="FRE"><s0>Propriété thermique</s0><s5>30</s5></fC03><fC03 i1="18" i2="3" l="ENG"><s0>Thermal properties</s0><s5>30</s5></fC03><fC03 i1="19" i2="X" l="FRE"><s0>Petit polaron</s0><s5>31</s5></fC03><fC03 i1="19" i2="X" l="ENG"><s0>Small polaron</s0><s5>31</s5></fC03><fC03 i1="19" i2="X" l="SPA"><s0>Pequeño polarón</s0><s5>31</s5></fC03><fC03 i1="20" i2="X" l="FRE"><s0>Haute température</s0><s5>32</s5></fC03><fC03 i1="20" i2="X" l="ENG"><s0>High temperature</s0><s5>32</s5></fC03><fC03 i1="20" i2="X" l="SPA"><s0>Alta temperatura</s0><s5>32</s5></fC03><fC03 i1="21" i2="3" l="FRE"><s0>Conduction saut</s0><s5>33</s5></fC03><fC03 i1="21" i2="3" l="ENG"><s0>Hopping conduction</s0><s5>33</s5></fC03><fC03 i1="22" i2="3" l="FRE"><s0>ZnO</s0><s4>INC</s4><s5>46</s5></fC03><fC03 i1="23" i2="3" l="FRE"><s0>P2O5</s0><s4>INC</s4><s5>47</s5></fC03><fC03 i1="24" i2="3" l="FRE"><s0>8105K</s0><s4>INC</s4><s5>71</s5></fC03><fC03 i1="25" i2="3" l="FRE"><s0>6540D</s0><s4>INC</s4><s5>72</s5></fC03><fC03 i1="26" i2="3" l="FRE"><s0>7138</s0><s4>INC</s4><s5>73</s5></fC03><fC03 i1="27" i2="3" l="FRE"><s0>7220E</s0><s4>INC</s4><s5>74</s5></fC03><fN21><s1>146</s1></fN21><fN44 i1="01"><s1>OTO</s1></fN44><fN82><s1>OTO</s1></fN82></pA></standard></inist><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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|étape= Checkpoint
|type= RBID
|clé= Pascal:14-0105766
|texte= Positive temperature coefficient and high Seebeck coefficient in ZnO-P2O5/Co composites
}}
| This area was generated with Dilib version V0.6.32. |  |