کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7851676 | 1508854 | 2015 | 20 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Confinement effects in irradiation of nanocrystalline diamond
ترجمه فارسی عنوان
اثرات سقوط در تابش الماس نانوبلور
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی (عمومی)
چکیده انگلیسی
Swift heavy ion irradiation does not generate amorphous tracks in diamond, contrary to what happens in graphite or in diamond-like carbon. Since nanocrystalline diamond is of interest for several technological applications we investigate the reason for this difference, by means of large scale atomistic simulations of ion tracks in nanocrystalline diamond, using a thermal spike model, with up to 2.5 million atoms, and grain sizes in the range 5-10Â nm. We conclude that tracking can be achieved under these conditions, when it is absent in single crystal diamond: for 5Â nm samples the tracking threshold is below 15Â keV/nm. Point defects are observed below this threshold. As the energy loss increases the track region becomes amorphous, and graphitic-like, with predominant sp2 hybridization. This higher sensitivity to irradiation can be related to a very large decrease in thermal conductivity of nanocrystalline diamond, due to grain boundary confinement of the heat spike which enhances localized heating of the lattice.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbon - Volume 93, November 2015, Pages 458-464
Journal: Carbon - Volume 93, November 2015, Pages 458-464
نویسندگان
Felipe Valencia, José D. Mella, Rafael I. González, Miguel Kiwi, Eduardo M. Bringa,