The dislocation resonance absorption of ultrasoundin KBr crystals at low temperatures
The frequency spectra of ultrasound dislocation losses in KBr single crystals with different dislocations density Λ have been researched at fixed temperatures in the T = 300-77 K interval. It is found that at any T = const within the mentioned range, the inversion effect is observed resulting from t...
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НТК «Інститут монокристалів» НАН України
2009
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Zitieren: | The dislocation resonance absorption of ultrasoundin KBr crystals at low temperatures // G.A. Petchenko, A.M. Petchenko // Functional Materials. — 2009. — Т. 16, № 3. — С. 253-257. — Бібліогр.: 21 назв. — англ. |
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irk-123456789-1389042018-06-20T03:03:58Z The dislocation resonance absorption of ultrasoundin KBr crystals at low temperatures Petchenko, G.A. Petchenko, A.M. Characterization and properties The frequency spectra of ultrasound dislocation losses in KBr single crystals with different dislocations density Λ have been researched at fixed temperatures in the T = 300-77 K interval. It is found that at any T = const within the mentioned range, the inversion effect is observed resulting from the sample deformation. The effect has been discussed in the framework of the dislocation interaction model. The viscosity coefficient B has been established to be independent of Λ within the whole temperature range. The experimental data on B(Λ) have been found to agree with the conclusions from the Alshits-Indenbom theory of dynamic dislocation drag. Досліджено частотні спектри дислокаційних втрат ультразвуку у монокристалах KBr з різною густиною дислокацій Λ при фіксованих температурах в інтервалі Т = 300- 77 К. Виявлено, що при будь-якій Т = const у вказаному діапазоні температур у частотному та амплітудному зміщеннях резонансу спостерігається ефект інверсії внаслідок деформування зразка. Обговорення вказаного ефекту виконано у рамках моделі дислокаційної взаємодії. Встановлено, що коефіцієнт в'язкості В не залежить від Λ у всьому інтервалі температур. Зазначено, що одержані експериментальні дані з В(Λ) узгоджуються з висновками теорії динамічного гальмування дислокацій Альшиця-Інденбома. Исследованы частотные спектры дислокационных потерь ультразвука в монокристаллах KBr с разной плотностью дислокаций Λ при фиксированных температурах в интервале Т = 300-77 К. Обнаружено, что при любой Т = const указанного диапазона температур в частотном и амплитудном смещениях резонанса наблюдается эффект инверсии вследствие деформирования образца. Обсуждение указанного эффекта проведено в рамках модели дислокационного взаимодействия. Установлено, что коэффициент вязкости В не зависит от Λ во всем интервале температур. Отмечается, что полученные экспериментальные данные по В(Λ) согласуются с выводами теории динамического торможения дислокаций Альшица-Инденбома. 2009 Article The dislocation resonance absorption of ultrasoundin KBr crystals at low temperatures // G.A. Petchenko, A.M. Petchenko // Functional Materials. — 2009. — Т. 16, № 3. — С. 253-257. — Бібліогр.: 21 назв. — англ. 1027-5495 http://dspace.nbuv.gov.ua/handle/123456789/138904 en Functional Materials НТК «Інститут монокристалів» НАН України |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine |
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Characterization and properties Characterization and properties |
spellingShingle |
Characterization and properties Characterization and properties Petchenko, G.A. Petchenko, A.M. The dislocation resonance absorption of ultrasoundin KBr crystals at low temperatures Functional Materials |
description |
The frequency spectra of ultrasound dislocation losses in KBr single crystals with different dislocations density Λ have been researched at fixed temperatures in the T = 300-77 K interval. It is found that at any T = const within the mentioned range, the inversion effect is observed resulting from the sample deformation. The effect has been discussed in the framework of the dislocation interaction model. The viscosity coefficient B has been established to be independent of Λ within the whole temperature range. The experimental data on B(Λ) have been found to agree with the conclusions from the Alshits-Indenbom theory of dynamic dislocation drag. |
format |
Article |
author |
Petchenko, G.A. Petchenko, A.M. |
author_facet |
Petchenko, G.A. Petchenko, A.M. |
author_sort |
Petchenko, G.A. |
title |
The dislocation resonance absorption of ultrasoundin KBr crystals at low temperatures |
title_short |
The dislocation resonance absorption of ultrasoundin KBr crystals at low temperatures |
title_full |
The dislocation resonance absorption of ultrasoundin KBr crystals at low temperatures |
title_fullStr |
The dislocation resonance absorption of ultrasoundin KBr crystals at low temperatures |
title_full_unstemmed |
The dislocation resonance absorption of ultrasoundin KBr crystals at low temperatures |
title_sort |
dislocation resonance absorption of ultrasoundin kbr crystals at low temperatures |
publisher |
НТК «Інститут монокристалів» НАН України |
publishDate |
2009 |
topic_facet |
Characterization and properties |
url |
http://dspace.nbuv.gov.ua/handle/123456789/138904 |
citation_txt |
The dislocation resonance absorption of ultrasoundin KBr crystals at low temperatures // G.A. Petchenko, A.M. Petchenko // Functional Materials. — 2009. — Т. 16, № 3. — С. 253-257. — Бібліогр.: 21 назв. — англ. |
series |
Functional Materials |
work_keys_str_mv |
AT petchenkoga thedislocationresonanceabsorptionofultrasoundinkbrcrystalsatlowtemperatures AT petchenkoam thedislocationresonanceabsorptionofultrasoundinkbrcrystalsatlowtemperatures AT petchenkoga dislocationresonanceabsorptionofultrasoundinkbrcrystalsatlowtemperatures AT petchenkoam dislocationresonanceabsorptionofultrasoundinkbrcrystalsatlowtemperatures |
first_indexed |
2025-07-10T06:48:27Z |
last_indexed |
2025-07-10T06:48:27Z |
_version_ |
1837241586845483008 |
fulltext |
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