کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7888330 | 1509793 | 2018 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Variation in structures and photoluminescence spectra of BaxEu1âxAl2O4 powders
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Barium europium(II) aluminate (BaxEu1âxAl2O4) powders were prepared by a solid-state reaction among barium carbonate (BaCO3), europium oxide (Eu2O3), and alumina (Al2O3) powders at 1400 °C for 3 h under a mixed gas flow of H2 and N2. The powders were characterized by powder X-ray diffraction (XRD), infrared and Raman spectroscopy, and photoluminescence (PL). With increasing Ba2+ content in BaxEu1âxAl2O4, the structure of BaxEu1âxAl2O4 changed from a monoclinic (P21) to hexagonal (P63) phase. The hexagonal (P6322) phase was also observed between the two phases. The XRD pattern of a single Ba0.6Eu0.4Al2O4 phase, which has not been reported in the literature, was refined by the Rietveld method and its structure was confirmed by selected-area electron diffraction. With increasing x value, the emission peak in the PL spectra of BaxEu1âxAl2O4 became weaker (x = 0-0.4) and then more intense (x = 0.6-0.98), and its position showed a blue shift from 520 to 498 nm.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 44, Issue 5, 1 April 2018, Pages 5063-5069
Journal: Ceramics International - Volume 44, Issue 5, 1 April 2018, Pages 5063-5069
نویسندگان
Min-Ho Lee, Bong-Ki Min, Woo-Sik Jung,