Abstract

High-temperature heat capacity and thermal diffusivity of neodymium zirconate (Nd 2Zr 2O 7) were measured by differential scanning calorimetry and laser flash, respectively. Measurements were made on pellets with the pyrochlore structure ( a=1.07 nm) that were fabricated from milled beads obtained by gel supported precipitation. The thermal conductivity, calculated from the measured heat capacity and thermal diffusivity, was lower than that for ZrO 2 stabilised in its cubic structure. These results show that the pyrochlore-type zirconate can be used as an inert matrix for minor actinides transmutation, but only in a composite form.

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