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 BaxEu1−xAl2O4 powders
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Variation in structures and photoluminescence spectra of BaxEu1−xAl2O4 powders
چکیده انگلیسی
Barium europium(II) aluminate (BaxEu1−xAl2O4) 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 BaxEu1−xAl2O4, the structure of BaxEu1−xAl2O4 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 BaxEu1−xAl2O4 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
نویسندگان
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