Ionic conductivity of Ce1?xNdxO2?x / 2 |
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| Institution: | 1. Center for Nanoscale Science and Engineering, University of California – Riverside, Riverside, CA 92521, USA;2. Department of Chemistry, University of California – Riverside, Riverside, CA 92521, USA;3. Department of Physics, King Abdulaziz University, Jeddah 21589, Saudi Arabia;4. Imaging and Characterization Core Lab and PSE, King Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia;5. Physics Department, Faculty of Science, University of Hail, Saudi Arabia;1. Department of Chemistry and Chemical Technologies, University of Calabria, 87036 Rende CS, Italy;2. Consiglio Nazionale delle Ricerche, Instituto di Tecnologie Avanzate per l’Energia “Nicola Giordano”, CNR-ITAE, Via Salita Santa Lucia sopra Contesse 5, 98126 Messina, Italy |
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| Abstract: | The electrical conductivity of sintered samples of Ce1?xNdxO2?x / 2 (0.01 ≤ x ≤ 0.2) was investigated in air as a function of temperature between 150 and 600 °C using AC impedance spectroscopy. The individual contribution of the bulk and grain boundary conductivities has been discussed in detail. In the low temperature range (< 350 °C), the activation enthalpy for bulk conductivity exhibited a shallow minimum at 3 mol% Nd, with a value of 0.68 eV. The activation enthalpy also produced a shallow minimum at 5 mol% Nd in the high temperature range (> 350 °C), with a value of 0.56 eV. It was shown that Ce1?xNdxO2?x / 2 is an electrolyte that obeys the Meyer Neldel rule. The bulk conductivity data measured by others for the same system has also been recalculated and re-evaluated to facilitate easier comparison with our own data. |
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