کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8150976 | 1524427 | 2014 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Optical floating zone method growth and optical properties of corundum Mg4Nb2O9 single crystal
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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
Mg4Nb2O9 single crystals were prepared by the optical floating zone method. While the as-grown were boules polycrystalline and cracked with dimensions of â
5-8Â mmÃL 91Â mm, they contained single crystal regions as large as â
4Â mmÃL 15Â mm. The X-ray diffraction analysis showed that the crystals had the corundum structure, grew along the a-axis and cleaved parallel to the c plane. Polarized light microscopy, in a cross-transmission configuration measurement, showed that the crystal was free of low-angle grain boundaries and bubbles. The optical interband transitions were measured from the absorption spectrum of the crystal along the c-axes at room temperature in the range of 200-800Â nm. Based on the theory of band-to-band transitions, the direct band gap was determined for the first time to be Eg=5.09Â eV. The photoluminescence spectra exhibited a broad and strong blue emission band centered at 450Â nm.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Crystal Growth - Volume 402, 15 September 2014, Pages 109-112
Journal: Journal of Crystal Growth - Volume 402, 15 September 2014, Pages 109-112
نویسندگان
Liang Li, Defang Duan, Qiang Zhou, Dapeng Xu, Tian Cui, Bingbing Liu, Hongming Yuan,