کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7922651 | 1511795 | 2015 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Sol-gel synthesis and crystallization kinetics of dysprosium-titanate Dy2Ti2O7 for photonic applications
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Sol-gel synthesis and crystallization kinetics of dysprosium-titanate Dy2Ti2O7 for photonic applications Sol-gel synthesis and crystallization kinetics of dysprosium-titanate Dy2Ti2O7 for photonic applications](/preview/png/7922651.png)
چکیده انگلیسی
We present a generic sol-gel approach for the preparation of nanocrystalline Dy2Ti2O7. This approach allows the preparation of powders and highly transparent thin films having nanocrystals of a tailored size. The thermal evolution of these nanocrystals was followed by conventional structural methods and furthermore, we determine both the kinetic parameters of the nanocrystal nucleation process from amorphous xerogel as well as the crystallization mechanism. The crystallization temperature was 798 ± 2 °C. The nanocrystal growth started by homogeneous nucleation with a constant nucleation rate followed by three dimensional growth. The activation energy of the crystallization was 780 kJ molâ1, and the energy of nanocrystal growth was 24.4 kJ molâ1. We demonstrate the existence of pure pyrochlore structure of Dy2Ti2O7 with the lattice parameter a equal to 10.2 Ã
. The structural evolution of nanocrystalline thin films was identical to that of the evolution of xerogels. A thin film of thickness 342Â nm exhibited an optical transmission of 93.39% with a refractive index of 2.138Â at 935Â nm. These results provide fundamental information about the crystallization behavior of Dy2Ti2O7: they can be used to prepare pure nanocrystalline xerogels and highly transparent thin films with tailored structural properties which are suitable for photonic applications.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Chemistry and Physics - Volume 168, 15 November 2015, Pages 159-167
Journal: Materials Chemistry and Physics - Volume 168, 15 November 2015, Pages 159-167
نویسندگان
Jan Mrázek, Michel Potel, JiÅà BurÅ¡Ãk, AleÅ¡ MráÄek, Anna Kallistová, Å árka JonáÅ¡ová, Jan BoháÄek, Ivan KaÅ¡Ãk,