کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5442831 | 1510768 | 2017 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Preparation and optical properties of hexa-tungsten bronze-type CsNbW2O9 semiconductor
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
CsNbW2O9 semiconductor nanoparticles were synthesized by the facile sol-gel method. The morphological characteristics were tested by SEM, TEM, and EDS measurements. The samples crystalized in the uniform nanoparticle with a diameter of about 50Â nm. The X-ray polycrystalline diffraction (XRD) measurements and the Rietveld refinements were completed to confirm the successful synthesis of CsNbW2O9 nanoparticles. CsNbW2O9 belongs to an interesting compound of AxWO3-type (AÂ =Â Cs) hexagonal tungsten bronzes with the partial substitution of W6+ by Nb5+ ions. In contrast to AxWO3 (AÂ =Â Cs) tungsten bronzes, which are nonstoichiometric compounds with metallic-type conductivity, CsNbW2O9 belongs to a typical semiconductor. The optical absorption, band gap energy and electronic structures were discussed. CsNbW2O9 semiconductor shows an indirect allowed transition with an energy gap of 2.38Â eV. Meanwhile, CsNbW2O9 shows a self-activated emission due to d0 transitions in (Nb/W)O6. The luminescence properties of CsNbW2O9 semiconductor with a low quenching temperature were discussed based on the distorted structure.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optical Materials - Volume 66, April 2017, Pages 361-366
Journal: Optical Materials - Volume 66, April 2017, Pages 361-366
نویسندگان
Ling Li, Hui Xu, Yanhu Chen, Yong Wang,