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Thermal Conductivity and Optical and Paramagnetic Absorption Spectra of Reactor Irradiated MgO Crystals
Author(s) -
Abramishvili M. G.,
Altukhov V. I.,
Kalabegishvili T. L.,
Kvachadze V. G.
Publication year - 1984
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221220111
Subject(s) - irradiation , thermal conductivity , materials science , annealing (glass) , crystal (programming language) , phonon , thermal , relaxation (psychology) , spectral line , conductivity , electron paramagnetic resonance , analytical chemistry (journal) , absorption (acoustics) , molecular physics , condensed matter physics , nuclear magnetic resonance , thermodynamics , chemistry , composite material , nuclear physics , physics , psychology , social psychology , chromatography , computer science , programming language , astronomy
The 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.