کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1334171 979152 2007 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Stabilized epitaxial films of hexagonal Ni1−xS on MgO(001)
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Stabilized epitaxial films of hexagonal Ni1−xS on MgO(001)
چکیده انگلیسی

This study used molecular beam epitaxy to prepare epitaxial Ni1−xS films with NiAs-type structures on MgO(001) substrates. The films were characterized using X-ray diffraction method. Nickel vacancies showed an ordered arrangement of alternating metal-rich and metal-deficient layers along the c-axis. The orientations of epitaxial films were (001) [1,−1,0]Ni1−xS||(001)[110]MgO and its equivalents because of the coexistence of the trigonal axis of the Ni1−xS film and the four-fold rotation axis of the MgO substrate. Film compositions were obtained using intensity ratios between 0 0 1 and 0 0 2 reflections and EPMA results. They were dependent on substrate temperature. The relation between lattice parameters and the composition, as determined by the intensity ratio, nearly agrees with that of previously reported bulk Ni1−xS. The films were stable at room temperature after 1 year, which contrasts with deterioration of bulk Ni1−xS. This paper presents SEM and RHEED assessments of the film's morphology and structure.

Composition dependence of lattice parameters. Open circles represent data of the present films. Open squares indicate results for Film2 after 1 year. Solid circles and crosses are data of bulk Ni1−xS previously reported.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Solid State Chemistry - Volume 178, Issue 6, June 2005, Pages 2001–2007
نویسندگان
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