Thermally induced phase decomposition and nanocrystal formation in murataite ceramics
| العنوان: | Thermally induced phase decomposition and nanocrystal formation in murataite ceramics |
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| المؤلفون: | Jie Lian, L. M. Wang, Rodney C. Ewing, S. V. Stefanovsky, Sergey V. Yudintsev |
| المصدر: | Journal of Materials Chemistry. 15:709 |
| بيانات النشر: | Royal Society of Chemistry (RSC), 2005. |
| سنة النشر: | 2005 |
| مصطلحات موضوعية: | Materials science, Energy-dispersive X-ray spectroscopy, Oxide, chemistry.chemical_element, General Chemistry, law.invention, Cerium, chemistry.chemical_compound, Nanocrystal, chemistry, Chemical engineering, law, Phase (matter), Materials Chemistry, Thermal stability, Crystallization, Radiation resistance, Nuclear chemistry |
| الوصف: | Synthetic murataite, an isometric derivative of the fluorite structure, has been proposed as a host phase for the immobilization of lanthanides and actinides. In this study, murataite polytypes have been synthesized in the system Ca–Ti–U–Mn–Al–Zr–Fe–Ce–O by melting oxide mixtures at 1400–1600 °C followed by crystallization under slightly oxidizing conditions. The phase and structural compositions of the synthetic murataite ceramics were characterized by energy dispersive spectroscopy and transmission electron microscopy (TEM). The thermal stability was studied by in-situ heat treatment under TEM observation. The influence of radiation damage as a result of alpha-decay events of the incorporated actinides on the thermal stability of the synthetic murataite ceramics was simulated by 1 MeV Kr+ irradiation. A thermally induced, Fe-rich phase decomposition and nanocrystal formation was observed in murataite ceramics under vacuum above 573 K. Ce was closely associated with the Fe-rich phase in the Ce-incorporated murataite ceramics. Ion beam irradiation-induced amorphization inhibited the process of phase decomposition. The effects of thermally induced phase decomposition on the radiation resistance of murataite ceramics utilized as potential nuclear waste forms for the immobilization of actinides and, particularly plutonium, were also analyzed. |
| تدمد: | 1364-5501 0959-9428 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_________::d4bfcd3ac532df6eb8c7b3f0a5c00ae7Test https://doi.org/10.1039/b411845fTest |
| رقم الانضمام: | edsair.doi...........d4bfcd3ac532df6eb8c7b3f0a5c00ae7 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 13645501 09599428 |
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