Phason-dynamics studied by quasielastic mössbauer scattering in i-Al–Cu–Fe quasicrystals
| العنوان: | Phason-dynamics studied by quasielastic mössbauer scattering in i-Al–Cu–Fe quasicrystals |
|---|---|
| المؤلفون: | Yvonne Calvayrac, J. Voss, Richard A. Brand |
| المصدر: | Materials Science and Engineering: A. :666-669 |
| بيانات النشر: | Elsevier BV, 2000. |
| سنة النشر: | 2000 |
| مصطلحات موضوعية: | Materials science, Condensed matter physics, Scattering, Mechanical Engineering, Dynamics (mechanics), chemistry.chemical_element, Quasicrystal, Condensed Matter Physics, Copper, chemistry, Mechanics of Materials, Mössbauer spectroscopy, General Materials Science, Phason, Jump process, Order of magnitude |
| الوصف: | Quasicrystals can show a new type of localised defect termed a ‘phason’. At high temperature, these defects become mobile and lead to short-ranged atomic motion without involving vacancies. Cu in i-Al–Cu–Fe is involved in such phason jump process at high temperatures T on a time scale τ of ℏ/250 μeV. Surprisingly, τ Cu was found independent of the temperature, indicating a type of ‘assisted’ jump process. In order to investigate the iron dynamics in this system, we have studied i-Al 62 Cu 25.5 57 Fe 12.5 using quasielastic Mossbauer spectroscopy for T ≤1100 K. We find a temperature-dependent iron phason jump process with τ Fe typically two orders of magnitude slower than copper. |
| تدمد: | 0921-5093 |
| DOI: | 10.1016/s0921-5093(00)01186-2 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::e551fab8e794613f9b100b271a2bea74 https://doi.org/10.1016/s0921-5093(00)01186-2 |
| Rights: | CLOSED |
| رقم الانضمام: | edsair.doi...........e551fab8e794613f9b100b271a2bea74 |
| قاعدة البيانات: | OpenAIRE |
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