کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1796169 | 1023737 | 2007 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
AlxGa1âxN (0⩽x⩽1) nanocrystalline powder by pyrolysis route
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: AlxGa1âxN (0⩽x⩽1) nanocrystalline powder by pyrolysis route AlxGa1âxN (0⩽x⩽1) nanocrystalline powder by pyrolysis route](/preview/png/1796169.png)
چکیده انگلیسی
A novel method to synthesize nanocrystalline AlxGa1âxN (0⩽x⩽1) powders is presented in this work. AlGaN nanocrystallites with the wurtzite structure were produced by thermal decomposition of a gallium-aluminum complex compound at 1000 °C in a three-zone horizontal quartz tube reactor under high-purity ammonia atmosphere. The crystallites showed a hexagonal structure, high homogeneity, and a narrow particle-size distribution at around 50 nm. A continuous composition range from 0 to 1 mol fraction can be reached by this method, allowing high control on the gallium and aluminum composition by monitoring the stoichiometry of the reaction between the metal nitrates and carbohydrazide. Low-temperature photoluminescence and cathodoluminescence studies showed that some impurities, such as carbon and oxygen, are unintentionally present in the final product and affect the optical properties. Subsequent thermal treatments between 900 and 1100 °C under an ammonia atmosphere significantly improved the quality of these materials.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Crystal Growth - Volume 308, Issue 1, 1 October 2007, Pages 198-203
Journal: Journal of Crystal Growth - Volume 308, Issue 1, 1 October 2007, Pages 198-203
نویسندگان
R. Garcia, S. Srinivasan, O.E. Contreras, A.C. Thomas, F.A. Ponce,