The competition of mechanisms of mobile dislocations blocking by various type stoppers in ionic crystals

Authors

  • O. Petchenko O.M. Beketov NUUE
  • G. Petchenko O.M. Beketov NUUE

Keywords:

dynamics of dislocations; amplitude-independent internal friction; frequency spectra of dislocation absorption of ultrasound; pre-deformation; the processes of detachment; Friedel-type pinning points'; Mott-type stoppers

Abstract

The purpose of this paper is boundaries of the Granato-Lucke model's efficiency settlement for describe physical processes of the dislocation mobility thermal activation in crystals. The experimental data of pulsed-method research in the frequency range 7,5 ... 232,5 MHz of the preliminary deformation effect  in the range of 0,23… 1 %, and at the temperature interval 77 ... 300 K on the frequency spectra localization  d(f) in the dislocation decrement of ultrasonic attenuation, as well as on dynamic (B) and structural characteristics (L,  ) of KBr crystals is analyzed. The competition of strong and weak stoppers in the processes of blocking mobile dislocations in the investigated crystals is vividly traced. The limiting value of   2,25 % is established, above which the thermal activation of the mobile dislocations' detachment from Friedel type stoppers is completely masked by more efficient processes of fixing dislocations by dislocation network nodes (Mott stoppers). According to our estimates, for ε, less than the specified limit value, the effect of thermal activation can be noticeable and, therefore, external factors influencing the dislocation structure of crystals (irradiation, magnetic processing, changeable chemical composition of samples) can be investigated by studying of the thermal effect on the unlocking of mobile dislocations by means of appropriate stoppers. For ε from 2.25% or more, fine structural experiments will become ineffective due to the strong background of dislocations' blocking by the dislocations of the “forest” and the masking of weak Friedel-type pinning points' effect by strong Mott-type stoppers. The analysis can be useful for researchers studying the influence of various factors on the mobility of dislocations in crystals. The preliminary deformation of the investigated samples is a mandatory procedure, since it allows for the insertion of mobile (“fresh”) dislocations into the crystal, but the value of must not exceed the limit specified by us. Otherwise, all the mentioned investigated facts will be completely masked by the strong processes of blocking the mobile dislocations by the dislocations of the “forest”.

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Published

2020-01-24

How to Cite

Petchenko, O., & Petchenko, G. (2020). The competition of mechanisms of mobile dislocations blocking by various type stoppers in ionic crystals. Lighting Engineering & Power Engineering, 2(52), 43–47. Retrieved from https://lepe.kname.edu.ua/index.php/lepe/article/view/411

Issue

Vol. 2 No. 52 (2018): Lighting engineering and power engineering

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