Electrical conductivity of new zinc phosphate glass/metal composites
Identifieur interne : 000036 ( Maroc/Analysis ); précédent : 000035; suivant : 000037Electrical conductivity of new zinc phosphate glass/metal composites
Auteurs : A. Maaroufi [Maroc] ; O. Oabi [Maroc] ; G. Pinto [Espagne] ; M. Ouchetto [Maroc] ; R. Benavente [Espagne] ; J. M. Perena [Espagne]Source :
- Journal of non-crystalline solids [ 0022-3093 ] ; 2012.
Descripteurs français
- Pascal (Inist)
- Conductivité électrique, Stabilité thermique, Analyse thermique différentielle, Microstructure, Fraction volumique, Porosité, Diffraction RX, Transition vitreuse, Modèle statistique, Théorie percolation, Matériau renforcé dispersion, Phosphate de zinc, Verre phosphate, Matériau composite, Oxyde de zinc, Poudre métallique, Nickel, Cobalt, Métal transition.
- Wicri :
- topic : Matériau composite, Nickel, Cobalt.
English descriptors
- KwdEn :
- Cobalt, Composite materials, Differential thermal analysis, Dispersion reinforced material, Electrical conductivity, Glass transition, Metal powder, Microstructure, Nickel, Percolation theory, Phosphate glass, Porosity, Statistical models, Thermal stability, Transition elements, Volume fraction, XRD, Zinc oxide, Zinc phosphate.
Abstract
Zinc phosphate-glass/metal composites have been successfully prepared. Glass with composition of 45 mol% ZnO-55 mol% P2O5 (ZP) has been filled with metallic powders (nickel and cobalt). The glass matrix thermal stability has been assessed by differential thermal analysis technique. The morphology has been examined by scanning electronic microscopy, showing almost homogenous composites. Comparison between the measured and calculated densities as a function of metallic content exhibits a good coherence and allows the estimation of porosity inside the composites. X-ray diffraction analysis has revealed that the ZP-matrix phase is amorphous when the temperature treatment is below the glass transition temperature Tg. However, the principal peaks observed in the case of the composites have been assigned to the metallic crystals of nickel or cobalt fillers. It has been found that the phosphate glass phase is not affected by the growing of the metallic network. The electronic conductivity measurements versus filler volume fraction have been investigated for the first time on phosphate-glass/metal composites. This study has shown the occurrence of a conducting transition at around 30% filler volume fraction. The obtained result has been interpreted on the basis of the statistical percolation theory frame.
Affiliations:
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Maaroufi</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>University of Mohammed V Agdal, Faculty of Sciences, Department of Chemistry, Laboratory of Composite Materials, Polymers and Environment, Avenue Ibn Batouta, 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="Oabi, O" sort="Oabi, O" uniqKey="Oabi O" first="O." last="Oabi">O. Oabi</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>University of Mohammed V Agdal, Faculty of Sciences, Department of Chemistry, Laboratory of Composite Materials, Polymers and Environment, Avenue Ibn Batouta, 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="Pinto, G" sort="Pinto, G" uniqKey="Pinto G" first="G." last="Pinto">G. Pinto</name><affiliation wicri:level="2"><inist:fA14 i1="02"><s1>Universidad Polirécnica de Madrid, Departamento de Ingenieria Quimica Industrial y del Medio Ambiente, E.T.S.I. Industriales</s1><s2>28006 Madrid</s2><s3>ESP</s3><sZ>3 aut.</sZ></inist:fA14><country>Espagne</country><placeName><region nuts="2" type="communauté">Communauté de Madrid</region></placeName></affiliation></author><author><name sortKey="Ouchetto, M" sort="Ouchetto, M" uniqKey="Ouchetto M" first="M." last="Ouchetto">M. Ouchetto</name><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Université Mohammed V Agdal, Faculté des Sciences, Departement de Chimie, Laboratoire de Chimie du Solide Appliquée, LAF 501, Avenue Ibn Batouta, B.P: 1014</s1><s2>Rabat Agdal</s2><s3>MAR</s3><sZ>4 aut.</sZ></inist:fA14><country>Maroc</country><wicri:noRegion>Rabat Agdal</wicri:noRegion></affiliation></author><author><name sortKey="Benavente, R" sort="Benavente, R" uniqKey="Benavente R" first="R." last="Benavente">R. Benavente</name><affiliation wicri:level="2"><inist:fA14 i1="04"><s1>Instituto de Ciencia y Tecnologia de Polímeros (ICTP-CSIC), Juan de la Cierva, 3</s1><s2>28006 Madrid</s2><s3>ESP</s3><sZ>5 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>Espagne</country><placeName><region nuts="2" type="communauté">Communauté de Madrid</region></placeName></affiliation></author><author><name sortKey="Perena, J M" sort="Perena, J M" uniqKey="Perena J" first="J. M." last="Perena">J. M. Perena</name><affiliation wicri:level="2"><inist:fA14 i1="04"><s1>Instituto de Ciencia y Tecnologia de Polímeros (ICTP-CSIC), Juan de la Cierva, 3</s1><s2>28006 Madrid</s2><s3>ESP</s3><sZ>5 aut.</sZ><sZ>6 aut.</sZ></inist:fA14><country>Espagne</country><placeName><region nuts="2" type="communauté">Communauté de Madrid</region></placeName></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="2012">2012</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>Composite materials</term><term>Differential thermal analysis</term><term>Dispersion reinforced material</term><term>Electrical conductivity</term><term>Glass transition</term><term>Metal powder</term><term>Microstructure</term><term>Nickel</term><term>Percolation theory</term><term>Phosphate glass</term><term>Porosity</term><term>Statistical models</term><term>Thermal stability</term><term>Transition elements</term><term>Volume fraction</term><term>XRD</term><term>Zinc oxide</term><term>Zinc phosphate</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Conductivité électrique</term><term>Stabilité thermique</term><term>Analyse thermique différentielle</term><term>Microstructure</term><term>Fraction volumique</term><term>Porosité</term><term>Diffraction RX</term><term>Transition vitreuse</term><term>Modèle statistique</term><term>Théorie percolation</term><term>Matériau renforcé dispersion</term><term>Phosphate de zinc</term><term>Verre phosphate</term><term>Matériau composite</term><term>Oxyde de zinc</term><term>Poudre métallique</term><term>Nickel</term><term>Cobalt</term><term>Métal transition</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Matériau composite</term><term>Nickel</term><term>Cobalt</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Zinc phosphate-glass/metal composites have been successfully prepared. Glass with composition of 45 mol% ZnO-55 mol% P<sub>2</sub>O<sub>5</sub> (ZP) has been filled with metallic powders (nickel and cobalt). The glass matrix thermal stability has been assessed by differential thermal analysis technique. The morphology has been examined by scanning electronic microscopy, showing almost homogenous composites. Comparison between the measured and calculated densities as a function of metallic content exhibits a good coherence and allows the estimation of porosity inside the composites. X-ray diffraction analysis has revealed that the ZP-matrix phase is amorphous when the temperature treatment is below the glass transition temperature T<sub>g</sub>. However, the principal peaks observed in the case of the composites have been assigned to the metallic crystals of nickel or cobalt fillers. It has been found that the phosphate glass phase is not affected by the growing of the metallic network. The electronic conductivity measurements versus filler volume fraction have been investigated for the first time on phosphate-glass/metal composites. This study has shown the occurrence of a conducting transition at around 30% filler volume fraction. The obtained result has been interpreted on the basis of the statistical percolation theory frame.</div></front></TEI><affiliations><list><country><li>Espagne</li><li>Maroc</li></country><region><li>Communauté de Madrid</li></region></list><tree><country name="Maroc"><noRegion><name sortKey="Maaroufi, A" sort="Maaroufi, A" uniqKey="Maaroufi A" first="A." last="Maaroufi">A. Maaroufi</name></noRegion><name sortKey="Oabi, O" sort="Oabi, O" uniqKey="Oabi O" first="O." last="Oabi">O. Oabi</name><name sortKey="Ouchetto, M" sort="Ouchetto, M" uniqKey="Ouchetto M" first="M." last="Ouchetto">M. Ouchetto</name></country><country name="Espagne"><region name="Communauté de Madrid"><name sortKey="Pinto, G" sort="Pinto, G" uniqKey="Pinto G" first="G." last="Pinto">G. Pinto</name></region><name sortKey="Benavente, R" sort="Benavente, R" uniqKey="Benavente R" first="R." last="Benavente">R. Benavente</name><name sortKey="Perena, J M" sort="Perena, J M" uniqKey="Perena J" first="J. M." last="Perena">J. M. Perena</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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