Kapitza Resistance of the Grain Boundaries in Ceria
Thermal conductivity is one of the key performance metrics of the nuclear fuels. In electrical insulators, such as most ubiquitous nuclear fuel -- UO2, thermal transport is due to phonons, or lattice waves. Their propagation is impeded by any lattice defect, such as impurities or vacancies, as well as larger microstructural features: grain boundaries, dislocations and pores/bubbles. Detailed description of the phonons interactions with these features is still lacking. In this work, we elucidate the dependence of the grain boundary thermal resistance, also known as a Kapitza resistance, on the type and misorientation angle of the grain boundary in model system of CeO2.
A. V. Chernatynskiy et al., "Kapitza Resistance of the Grain Boundaries in Ceria," Transactions of the American Nuclear Society, vol. 110, pp. 901-902, American Nuclear Society (ANS), Jun 2014.
Annual Meeting on Transactions of the American Nuclear Society and Embedded Topical Meeting: Nuclear Fuels and Structural Materials for the Next Generation Nuclear Reactors (2014: Jun 15-19, Reno, NV)
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01 Jun 2014