| Autor: |
Chiranjit Nandi, Santu Kaity, Dheeraj Jain, V. Grover, Amrit Prakash, P.G. Behere |
| Jazyk: |
angličtina |
| Rok vydání: |
2021 |
| Předmět: |
|
| Zdroj: |
Nuclear Engineering and Technology, Vol 53, Iss 2, Pp 603-610 (2021) |
| Druh dokumentu: |
article |
| ISSN: |
1738-5733 |
| DOI: |
10.1016/j.net.2020.07.022 |
| Popis: |
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 (Zr0.8Nd0.2O1.9; using Nd2O3 as a surrogate for Am2O3) and its composites with MgO. The composite was prepared by a solid-state reaction of Zr0.8Nd0.2O1.9 (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 Zr0.8Nd0.2O1.9 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 Zr0.8Nd0.2O1.9. Thermal conductivity was calculated from measured thermal diffusivity, temperature-dependent density and specific heat values. Thermal conductivity of Zr0.8Nd0.2O1.9–MgO (50 wt%) composite is more than that of typical UO2 fuel, supporting the potential of Zr0.8Nd0.2O1.9–MgO composites as target materials for minor actinides transmutation. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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