Subjects of research: impact and non-impact formation of defects in quartz crystals containing various types of structure defects.
Purpose of the work: To study the influence of the structure transformations in quartz crystals on the processes of impact and non-impact formation of additional point structure imperfections.
Methods of research: standard optical methods, study of defects depth distribution of the defects caused by p, d and a-particles in layers of quartz crystals.
The results obtained and their novelty: For the first time, the influence of change in type and increase in concentration of defects at particular depth in the damaged layers of the quartz crystal on the processes of impact and non-impact formation of additional structure defects was studied. It was demonstrated that the nucleus of amorphous phase (AP), containing E\- centres and NBOHC, are formed in the layer of crystal damaged by elastic energy losses by p, d and a - particles. Such increase in AP nucleus concentration at particular depth of the damaged layer increases the probability of impact and nonimpact formation of additional point defects. The efficiency of impact formation of additional point defects in the layers of the quartz crystals damaged by p, d and a -particles in the layers, containing point defects and some individual AP nuclei, is higher than in the continuous quasi-amorphous layer. It is shown that the probability of nonimpact formation of additional point defects increases with change in type and increase of concentration of preliminary structure imperfections. In the quartz crystals, containing the mixture of a -, P- and amorphous phases, the efficiency of non-impact formation of additional - centres in amorphous phase of quartz increases with the p - phase concentration.
Practical value: The results of this work make a significant contribution to the theory of radiation-induced structure defects in solids, and are of special importance for determination of the impact and non-impact formation of additional point defects dependence on the type and concentration of preliminary structure imperfections in quartz crystals.
Degree of embed and economic effectivity: The results of research work can be used when modifying the quartz crystals synthesis, and when solving problems, connected with the study and construction of new radiation-stable and sensitive materials on the basis of various structure modifications of SiCK
Field of application: fiber optics, crystal growth, optic instrument industry, solid-state physics.
