کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7922014 | 1511756 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microstructure and luminescence of erbiumdoped Na2O/K2O/CaO/CaF2/Al2O3/SiO2 nano glass-ceramics
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Oxyfluoride glasses with the mol% compositions (63-x) SiO2, x Al2O3, 12.3 CaO, 5.3 K2O, 9.0 Na2O and 10.4 CaF2 with x = (10, 8, 6) were doped with an Er3+-concentration of 1·1020â¯cmâ3. The glasses were thermally treated at temperatures in the range from 550 to 620â¯Â°C. This led to the crystallization of cubic CaF2 with extremely broadened XRD-lines caused by mean crystallite sizes ranging from 14 to 38â¯nm. An interface controlled crystallization mechanism is proposed. Phase separation was observed in the as casted glasses by electron microscopy. Droplet like particles occur with a size of ca. 360â¯nm after heat treatment. These particles are composed by small crystallites with sizes of around 50â¯nm. Increasing Al2O3 concentration increases the tendency to liquid/liquid phase separation and decreases the crystallization temperature. Doping with Er3+ triggers CaF2 nanocrystallization by decreasing the crystallization temperature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Chemistry and Physics - Volume 207, 1 March 2018, Pages 36-43
Journal: Materials Chemistry and Physics - Volume 207, 1 March 2018, Pages 36-43
نویسندگان
Martina Stoica, Martin Brehl, Christian Bocker, Andreas Herrmann, Christian Rüssel,