Influence of elastic stresses and temperature on the dislocation unpinning from the stoppers in KCl crystals
Vernadsky National Library of Ukraine
Переглянути архів Інформація| Поле | Співвідношення | |
| Title |
Influence of elastic stresses and temperature on the dislocation unpinning from the stoppers in KCl crystals
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| Creator |
Petchenko, G.A.
Petchenko, A.M. |
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| Subject |
Characterization and properties
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| Description |
Impulse echo-method was applied to investigate, in the temperature range from 300 to 430 K at 7.5 MGz frequency, the dislocation absorption αd(σ) in KCl crystals as a function of statistic loading in the quasi-elastic strain range. It has been found that the temperature increase at stresses σ < σt (σt is the yield strength of a crystal) leads to the intensive dislocation unpinning). Consequently, concentration of stoppers, controlling their motion, sharply decreases and the effective length of oscillating dislocation segments increases. As a result of the experimental data processing the energy of the impurity atom binding with dislocation U₀ and quantity L characterizing a mean size of the dislocation cell was calculated. The experimental results were discussed within the framework of known dislocation theories.
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| Date |
2017-06-06T17:04:09Z
2017-06-06T17:04:09Z 2015 |
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| Type |
Article
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| Identifier |
Influence of elastic stresses and temperature on the dislocation unpinning from the stoppers in KCl crystals / G.A. Petchenko, A.M. Petchenko // Functional Materials. — 2015. — Т. 22, № 3. — С. 293-298. — Бібліогр.: 14 назв. — англ.
1027-5495 DOI: http://dx.doi.org/10.15407/fm22.03.293 http://dspace.nbuv.gov.ua/handle/123456789/119370 |
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| Language |
en
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| Relation |
Functional Materials
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| Publisher |
НТК «Інститут монокристалів» НАН України
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