کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1793768 1023682 2009 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nano-crystallization in LaF3–Na2O–Al2O3–SiO2 glass
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Nano-crystallization in LaF3–Na2O–Al2O3–SiO2 glass
چکیده انگلیسی

Aiming at tailoring optical properties, the precipitation of LaF3 nano-crystals in LaF3–Na2O–Al2O3–SiO2 glass-ceramics is studied thoroughly on the nano-scale using advanced transmission electron microscopic techniques. Nano-sized phase-separation droplets enriched in lanthanum and silicon are formed already in the base glass. Within these less than 20 nm large droplets, LaF3 crystallizes upon heat treatment. The nano-crystallization mechanism revealed is self-limited since growth is restricted by the size of the droplets. An average crystallite size of around 12 nm is achieved with a narrow size distribution since the phase-separation droplets also contain silicon not incorporated into the growing crystal. Instead, excess silicon relocated to the periphery of the pre-existing phase-separation droplets forms a diffusion barrier around the LaF3 nano-crystals preventing further crystal growth and/or ripening.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Crystal Growth - Volume 311, Issue 18, 1 September 2009, Pages 4350–4355
نویسندگان
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