کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9594622 | 1507971 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Polar and non-polar domain borders in MgO ultrathin films on Ag(0Â 0Â 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: Polar and non-polar domain borders in MgO ultrathin films on Ag(0Â 0Â 1) Polar and non-polar domain borders in MgO ultrathin films on Ag(0Â 0Â 1)](/preview/png/9594622.png)
چکیده انگلیسی
The morphology of ultrathin epitaxial MgO layers reactively grown at 470Â K and at 1Â MLÂ minâ1 on Ag(0Â 0Â 1) was investigated by scanning tunnelling microscopy (STM). At deposition of 1.3 and 2.6Â ML, square MgO domains of about (10Â ÃÂ 10)Â nm2 form. On mono- and bi-layer domains, edges are mainly oriented along the ã1Â 1Â 0ã oxide direction, corresponding to polar (P) borders, while on multi-layer domains also non-polar (NP) borders appear, corresponding to the ã1Â 0Â 0ã orientation. By using periodic models and ab initio DFT calculations, the energetics of the two orientations was studied. Interaction with the metal substrate was found to strongly reduce the instability of P borders, although not enough to make the two orientations equally stable. The results are discussed, also with reference to conflicting experimental evidence from other laboratories.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Surface Science - Volume 588, Issues 1â3, 20 August 2005, Pages 160-166
Journal: Surface Science - Volume 588, Issues 1â3, 20 August 2005, Pages 160-166
نویسندگان
A.M. Ferrari, S. Casassa, C. Pisani, S. Altieri, A. Rota, S. Valeri,