کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5423946 | 1395808 | 2009 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Phase coexistence between the (â3 Ã â3)R30° - β and (1 Ã 1) phases on Pb/Ge(1 1 1)
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Phase coexistence between the (â3 Ã â3)R30° - β and (1 Ã 1) phases on Pb/Ge(1 1 1) Phase coexistence between the (â3 Ã â3)R30° - β and (1 Ã 1) phases on Pb/Ge(1 1 1)](/preview/png/5423946.png)
چکیده انگلیسی
We have characterized the phase transition between the (1 Ã 1) and (â3 Ã â3)R30° - β phases on Pb/Ge(1 1 1) using low energy electron microscopy (LEEM). We show that the transition is first-order and that, in the coexistence region of the two phases, the dominant mechanism for phase separation changes critically with Pb coverage, from nucleation and growth at 1.33 ML (saturation coverage of the β phase) to spontaneous domain switching due to thermal fluctuations of the local Pb density for slightly smaller coverage. As the Pb coverage decreases, the concentration of vacancies in the β phase increases, making additional possible Pb adsorption sites available. The larger resulting local density fluctuation of Pb becomes comparable to the density difference of the two phases, manifesting itself in the observed domain switching.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface Science - Volume 603, Issue 15, 1 August 2009, Pages 2300-2304
Journal: Surface Science - Volume 603, Issue 15, 1 August 2009, Pages 2300-2304
نویسندگان
Y. Sato, S. Chiang,