کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9817665 | 1518769 | 2005 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Investigation of the formation and phase transition of Ge and Co nanoparticles in a SiO2 matrix
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سطوح، پوششها و فیلمها
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چکیده انگلیسی
The evolution of ion beam synthesized Co and Ge nanoclusters into a SiO2 matrix during annealing processes has been investigated by X-ray diffraction and transmission electron microscopy. Remarkable differences have been found between Ge and Co clusters behaviour. For Ge implanted SiO2 films, a clear influence of near-surface Ge oxidation and nanoclusters melting has been established. Annealing at temperatures around 1000 °C leads to the formation of small (diameter â¼5 nm) nanocrystals. Classical Ostwald ripening mainly drives the clusters thermodynamical growth. On the contrary, for Co-implanted SiO2 films, a jump-like transition in nanoclusters evolution has been established at about 800 °C. A homogenous distribution of small (diameter â¼4 nm) amorphous clusters is transformed into a bimodal clusters profile, characterised by large (diameter between 20 and 40 nm) nanocrystals near the surface and a region of smaller clusters (diameter â¼7 nm) in depth. During Co nanoclusters formation the influence of nanoclusters melting can be neglected.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms - Volume 238, Issues 1â4, August 2005, Pages 268-271
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms - Volume 238, Issues 1â4, August 2005, Pages 268-271
نویسندگان
V. Cantelli, J. von Borany, A. Mücklich, N. Schell,