There are twelve known carbides of the fluorite structure with transition temperatures from 350-1450 C. Small quantities of these carbides in powder form will be purchased when commercially available. Pellets pressed from powder within an inert atmosphere will be made, CVI treated, and tested as described in Task #l. Pure carbides will be tested first, followed by carbides doped with impurities of different electrical valences whose atomic radii are favorable for solubility in the carbide

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... e structure. Dopants will be introduced either during the chemical formation of the carbide, by mix and sinter diffusion, or by high energy ion bombardment of the powder prior to pelletization. The approximate time period for completion of Task is twelve months." Report of Work Completed to Date The research project is proceeding with the construction of apparatus to create a solid electrolyte in the form of castings, or highly pressed and sintered pellets, of CeC2 and Lac2 and to test the castings (or pellets) for the ionic conduction of carbon-ions across the electrolyte, and the attendant, but undesirable, parasitic conduction of electrons across the electrolyte.