Abstract
Abstract Stable Th/Y oxide sols were prepared by peptization of the washed hydroxides and converted by different solidification methods to sinterable ThO 2 /Y 2 O 3 powders which were compared with coprecipitated ThO 2 /Y 2 O 3 powder. The best powder properties were obtained if the Th/Y oxide sol was solidified by internal gelation. Slip casting and subsequent cold isostatic pressing of the sol-gel-derived powder resulted in densities of sintered crucibles or plates of 98·8%, direct cold isostatic pressing in 99·5% of the theoretical density. EMF measurements using sol-gel-derived ThO 2 /Y 2 O 3 plates gave results which agreed with data from measurements using ZrO 2 /Y 2 O 3 solid electrolytes and with literature data.
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