Abstract
AbstractThe effect of reactor irradiation on thermal and optical properties of MgO is studied experimentally and theoretically. Optimum regimes of irradiation and annealing are selected, which promote the accumulation of a great number of F‐centres in the crystal and allow to reveal a relevant bend on the thermal conductivity curve x(T) at T ≈ 10 K. A general expression for the resonance inverse relaxation time of phonons' on F‐centers is obtained. Parameters of the model and basic mechanisms of thermal resistance of n,γ‐irradiated MgO crystals are determined. It is shown that the low temperature irradiation leads to more effective accumulation of F‐ and F+‐centres and hence to a stronger radiation change of the thermal conductivity.
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