This article is cited in 9 papers

Thermal properties

Soliton microdynamics and thermal conductivity of uranium nitride at high temperatures

O. A. Dubovsky, A. V. Orlov, V. A. Semenov

Institute for Physics and Power Engineering named after A. I. Leypunsky, Obninsk, Kaluga region

Abstract: The microdynamics of soliton waves and localized modes of nonlinear vibrations of the acoustic and optical types in uranium nitride has been investigated. It has been shown that, with an increase in the excitation energy in the spectral gap between the bands of optical and acoustic phonons, the energies of solitons increase, whereas the energies of local modes decrease. The previously experimentally observed unidentified quasi-resonant features, which shift in the gap with variations in the temperature, can represent the revealed soliton waves and local modes. The microdynamics of heat conduction of uranium nitride has been studied for the stochastic generation of soliton waves and local modes in the case of spatially distant energy absorption. The thermal conductivity coefficient determined from the temperature gradient and the absorbed energy flux insignificantly exceeds the experimentally observed values, which are decreased because of the presence of structural defects of different types in the material.

Received: 28.02.2011

 English version: Physics of the Solid State, 2011, 53:9, 1963–1974

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