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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Datum:2009
Hauptverfasser: Petchenko, G.A., Petchenko, A.M.
Format: Artikel
Sprache:English
Veröffentlicht: НТК «Інститут монокристалів» НАН України 2009
Schriftenreihe:Functional Materials
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Online Zugang:http://dspace.nbuv.gov.ua/handle/123456789/138904
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Назва журналу:Digital Library of Periodicals of National Academy of Sciences of Ukraine
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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spelling 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
institution Digital Library of Periodicals of National Academy of Sciences of Ukraine
collection DSpace DC
language English
topic 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
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