کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1625050 | 1516425 | 2008 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Lanthanide doped strontium barium niobate: Optical spectroscopy and local structure at the impurity sites
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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![عکس صفحه اول مقاله: Lanthanide doped strontium barium niobate: Optical spectroscopy and local structure at the impurity sites Lanthanide doped strontium barium niobate: Optical spectroscopy and local structure at the impurity sites](/preview/png/1625050.png)
چکیده انگلیسی
Strontium barium niobate (SBN), SrxBa1âxNb2O6 single crystals and nanocrystalline powders doped with different Ln3+ ions have been obtained for various values of x. Their optical spectroscopy and Ln edge EXAFS have been investigated in detail, in particular in order to identify the classes of sites occupied by the dopant ions. Whilst Eu3+ appears to enter mainly sites with coordination number 12 in the single crystals, the smaller ion Er3+ is mainly accommodated in octahedral sites. The luminescence spectra of the nanocrystalline materials are strong and similar to the ones of the single crystals, although some broadening appears to be present. Strong green upconversion is obtained upon excitation at 800Â nm for nanocrystalline Sr0.5Ba0.5Nb2O6 doped with 1Â mol% Er3+.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 451, Issues 1â2, 28 February 2008, Pages 12-17
Journal: Journal of Alloys and Compounds - Volume 451, Issues 1â2, 28 February 2008, Pages 12-17
نویسندگان
Matteo Daldosso, Adolfo Speghini, Paolo Ghigna, Maria de la O. Ramirez, Daniel Jaque, Luisa E. Bausá, José GarcÃa Solé, Marco Bettinelli,