Origin of Low Thermal Conductivity in Nuclear Fuels

Details Origin of Low Thermal Conductivity in Nuclear Fuels Origin of Low Thermal Conductivity in Nuclear Fuels

2008-02-14

arxiv.org/abs/0802.2006v1

Phys. Rev. Lett, 100, 225504 (2008)

Physics

Condensed Matter

Materials Science

4 pages, 3 figures, 1 table

Scientific paper

10.1103/PhysRevLett.100.225504

Using a novel many-body approach, we report lattice dynamical properties of UO2 and PuO2 and uncover various contributions to their thermal conductivities. Via calculated Grueneisen constants, we show that only longitudinal acoustic modes having large phonon group velocities are efficient heat carriers. Despite the fact that some optical modes also show their velocities which are extremely large, they do not participate in the heat transfer due to their unusual anharmonicity. Ways to improve thermal conductivity in these materials are discussed.

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