کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9829423 | 1524490 | 2005 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
BaTiO3 nanocrystals: Hydrothermal synthesis and structural characterization
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The microstructure of BaTiO3 (BT) nanocrystals was investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), selected area electron diffraction (SAED), and (high-resolution) transmission electron microscopy [(HR)TEM]. The BT nanocrystals have a cubic perovskite structure as revealed by XRD and SAED. They were prepared by a hydrothermal method using different starting materials: (i) Using as-prepared titanium hydroxide and barium hydroxide as starting materials, BT nanocrystals were obtained with a narrow size distribution and an average grain size of 65Â nm, exhibiting a spherical particle morphology and smooth surfaces. These nanocrystals showed almost uniform contrast in TEM. HRTEM lattice fringe images indicate a rather uniform, perfect crystal structure. (ii) Using barium hydroxide and titanium dioxide (anatase) as starting materials, many coarse-faceted cubic nanocrystals and a small amount of spherical particle were observed, indicating a developed bimodal size distribution. Diffraction contrast variations across these particles indicate the presence of high strain in these BT particles. The strain is probably caused by the lattice defects like OHâ ions and their compensation by cation vacancies. HRTEM images demonstrated that (1Â 0Â 0) and (1Â 1Â 0) surface facets are present on these particles. In addition they revealed the presence of very small-nucleated BT islands at the edges of the faceted particles.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Crystal Growth - Volume 283, Issues 3â4, 1 October 2005, Pages 553-562
Journal: Journal of Crystal Growth - Volume 283, Issues 3â4, 1 October 2005, Pages 553-562
نویسندگان
Xinhua Zhu, Jianmin Zhu, Shunhua Zhou, Zhiguo Liu, Naiben Ming, Dietrich Hesse,