کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8000512 | 1516274 | 2015 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Optoelectronic investigation of corundum Mg4Nb2O9 single crystal
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
The Mg4Nb2O9 crystals grown by floating zone technology were used as prototypes to investigate optoelectronic parameters by measuring the absorption and transmittance spectra along the c-axis from 200 to 800Â nm at room-temperature. The imaginary and real parts of the complex dielectric constants, extinction coefficient and refractive index for Mg4Nb2O9 were obtained. The Cauchy-Sellmeier equation for Mg4Nb2O9 was validated in the Urbach tail region (4.0-5.0Â eV). The dispersion energy Ed and oscillator energy E0 were obtained via the single oscillator approximation. More interestingly, the self-trapped exciton and disorder of Mg2+ and Nb5+ between MgO6 and NbO6 octahedrons participating in the transition in the Urbach tail region were confirmed by the excitation spectrum.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 619, 15 January 2015, Pages 240-243
Journal: Journal of Alloys and Compounds - Volume 619, 15 January 2015, Pages 240-243
نویسندگان
Liang Li, Defang Duan, Qiang Zhou, Dapeng Xu, Tian Cui, Bingbing Liu, Zhan Shi, Hongming Yuan,