Graduate Thesis Or Dissertation
 

High Temperature Electrical Properties of Ceria-Based Ceramics for Use as Electrodes in Magnetohydrodynamic Power Generators

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/057421269

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  • Determining the electrical properties of ceria-based materials is important for their use as electrodes in hot-wall magnetohydrodynamic (MHD) power generators with wall temperatures greater than 1500 ̊C. The electrical conductivity of a material can be used in models for predicting the performance of generator designs. More specifically, the temperature dependent properties play a critical role when channel walls are subjected to extreme temperature gradients. However, determining the electrical properties of ceria-based materials is more challenging than traditional electrical conductors due to mixed conduction from electronic and ionic carriers. These underlying conduction mechanisms can be determined from measurements, with the aid of literature, but measurements at MHD operating temperatures are difficult due to extreme temperatures and limitations in equipment. Electrical conductivity was determined for ceria-based ceramic materials from measurements using a custom designed van der Pauw apparatus. All three compositions measured were found to reach sufficient electrical conductivity to perform as electrode materials in an MHD power generator. Conductivity values for undoped CeO2 and Ta0.02Ce0.98O2 showed that while doping increased the electrical conductivity at temperatures below 1400 ̊C, at MHD operating temperatures of 1500 ̊C and above, doping had little effect on the electrical conductivity. On the other hand, Gd-doping was found to reduce conductivity at temperatures exceeding 1400 ̊C. These reported values of conductivity over the temperature range of 300 ̊C up to 1600 ̊C can be used in predictive models to gauge performance of these materials as potential electrodes in MHD power generators.
  • Keywords: Materials Science, Electrical Conductivity, Oxides, Electrical Properties, Ultra high temperature, Cerium Oxide, Magnetohydrodynamics
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