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- 저자 : Kaity, Santu (검색결과 1 건)
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Nandi, Chiranjit,Kaity, Santu,Jain, Dheeraj,Grover, V.,Prakash, Amrit,Behere, P.G. Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.2
The major drawback of zirconia-based materials, in view of their applications as targets for minor actinide transmutation, is their poor thermal conductivity. The addition of MgO, which has high thermal conductivity, to zirconia-based materials is expected to improve their thermal conductivity. On these grounds, the present study aims at phase characterization and thermophysical property evaluation of neodymium-substituted zirconia (Zr<sub>0.8</sub>Nd<sub>0.2</sub>O<sub>1.9</sub>; using Nd<sub>2</sub>O<sub>3</sub> as a surrogate for Am<sub>2</sub>O<sub>3</sub>) and its composites with MgO. The composite was prepared by a solid-state reaction of Zr<sub>0.8</sub>Nd<sub>0.2</sub>O<sub>1.9</sub> (synthesized by gel combustion) and commercial MgO powders at 1773 K. Phase characterization was carried out by X-ray diffraction and the microstructural investigation was performed using a scanning electron microscope equipped with energy dispersive spectroscopy. The linear thermal expansion coefficient of Zr<sub>0.8</sub>Nd<sub>0.2</sub>O<sub>1.9</sub> increases upon composite formation with MgO, which is attributed to a higher thermal expansivity of MgO. Similarly, specific heat also increases with the addition of MgO to Zr<sub>0.8</sub>Nd<sub>0.2</sub>O<sub>1.9</sub>. Thermal conductivity was calculated from measured thermal diffusivity, temperature-dependent density and specific heat values. Thermal conductivity of Zr<sub>0.8</sub>Nd<sub>0.2</sub>O<sub>1.9</sub>-MgO (50 wt%) composite is more than that of typical UO<sub>2</sub> fuel, supporting the potential of Zr<sub>0.8</sub>Nd<sub>0.2</sub>O<sub>1.9</sub>-MgO composites as target materials for minor actinides transmutation.
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