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By means of several methods (fractography, selective etching, electronography, absorption spectroscopy, optical microscopy in transmitted polarized light, measuring of the temperature dependence of conductivity, estimation of mechanical properties by microhardness, yield point and dimension of dislocation rosettes) the nature of damages created in LiF crystals by bombardment with heavy ions (carbon, chromium, and xenon) having high energy (up to 100 MeV) is studied. It follows from the results that the effect of implanted heavy ions on the defect structure is complicated. A sputtering or/and evaporation of LiF from the irradiated zone is discovered; there are strong damages including radiolysis effects inside this zone. Changes beyond the implantation zone are revealed, where the traces of the spreading shock wave and secondary ionizing radiation are evident.

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By several spectral (absorption, thermoluminescence, thermoemission of exoelectrons, EPR) and mechanical (indentation, measuring of stress relaxation rate and velocity of individual dislocations) methods the nature of irradiation hardening in LiF: Mg on the early stages of irradiation is studied. It is stated that initial irradiation hardening (at doses < 104 R) is due to interaction of the irradiation with impurity complexes.