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      Electrical conductivity of the ionic conductor tetragonal (Bi2O3)1-x(Eu2O3)x Translated title: Condutividade elétrica do condutor iônico (Bi2O3)1-x(Eu2O3)x tetragonal

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          Abstract

          Electrical conductivity of tetragonal β-phase (Bi2O3)1-x(Eu2O3)x (0.01 ≤ x ≤ 0.10 %mol) ceramic systems were investigated. The temperature and doping concentration dependences of the electrical conductivity were studied by four-point probe technique. The electrical conductivity increases with the increasing doping concentration and temperature. The highest value of the electrical conductivity is 0.013 Ω-1cm-1 (x = 0.05, 750 ºC) for the β-phase at 670 ºC and 0.57 Ω-1cm-1 (x=0.05, 800 ºC) in binary systems at 690 ºC. The phase transition which manifests itself by the jump in the conductivity curves was seen and verified by differential thermal analysis measurements. The activation energies of the samples were found to be about 0.71-1.57 eV.

          Translated abstract

          Foi estudada a condutividade elétrica de sistema cerâmicos da fase β tetragonal (Bi2O3)1-x(Eu2O3)x (0,01 ≤ x ≤ 0,10 mol%). A dependência da condutividade elétrica da temperatura e da concentração de dopantes foi estudada pela técnica das quatro pontas de prova. A condutividade elétrica aumenta com o aumento da concentração de dopantes e da temperatura. O maior valor da condutividade elétrica é 0,013 Ω-1cm-1 (x = 0,05, 750 ºC) para a fase β a 670 ºC e 0,57 Ω-1cm-1 (x = 0,05, 800 ºC) em sistema binários a 690 ºC. A transição de fase que se verifica pelo salto nas curvas de condutividade elétrica foi confirmada por medidas de análise térmica diferencial. As energias de ativação para as várias amostras está na faixa 0,71-1,57 eV.

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          Most cited references 29

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          Introduction to Solid State Physics

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            Semiconductor Material and Device Characterization

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              Recent advances in asymmetric oxidative coupling of 2-naphthol and its derivatives.

               Hui-Hui Wang (2010)
              The enantiomeric atropoisomers of 1,1'-binaphthyl-2,2'-diol (BINOL) have become one of the most widely used chiral ligands and auxiliaries for asymmetric synthesis. This review provides an overview of enantioselective synthesis of optical active BINOLs by straightforward asymmetric oxidative coupling of identical 2-naphthol and its substituted derivatives.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                ce
                Cerâmica
                Cerâmica
                Associação Brasileira de Cerâmica (São Paulo )
                1678-4553
                June 2011
                : 57
                : 342
                : 185-192
                Affiliations
                [1 ] Mersin University Turkey
                [2 ] Erciyes University Turkey
                [3 ] Abant Izzet Baysal University Turkey
                Article
                S0366-69132011000200009
                10.1590/S0366-69132011000200009
                Product
                Product Information: website
                Categories
                MATERIALS SCIENCE, CERAMICS

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