کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5402249 1505928 2010 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Preparation, characterization and luminescence properties of porous Si3N4 ceramics with Eu2O3 as sintering additive
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Preparation, characterization and luminescence properties of porous Si3N4 ceramics with Eu2O3 as sintering additive
چکیده انگلیسی
Porous Si3N4 ceramics with photoluminescence properties were prepared by pressureless sintering using α-Si3N4 powder as raw material and Eu2O3 as sintering additive. Chemical composition, phase formation, microstructure and photoluminescence properties of porous Si3N4 ceramics were studied by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence measurements (PL/PLE). The results show that single Eu2O3 additive promotes α→β transformation but not significant densification. A broad band emission center at 570 nm assigned to Eu2+ is observed, Eu3+ in Eu2O3 is (partially) converted to Eu2+ by reaction with Si3N4, which results in a lower β aspect ratio and β-content compared to the other Ln (Ln=lanthanide) oxide additives.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Luminescence - Volume 130, Issue 12, December 2010, Pages 2298-2304
نویسندگان
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