کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10625218 989615 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
An electron paramagnetic resonance and optical study of Cr doped BaAl12O19 powders
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
An electron paramagnetic resonance and optical study of Cr doped BaAl12O19 powders
چکیده انگلیسی
The BaAl12O19 powders doped with Cr3+ ions have been prepared by a low-temperature combustion synthesis method. As prepared combustion synthesized powder was characterized using powder X-ray diffraction and energy dispersive analysis of X-ray methods. The diffuse reflectance spectrum exhibits three bands characteristic of Cr3+ ions in distorted octahedral symmetry. The EPR spectra exhibit signals with the effective g values at g=1.96, 2.27 and 4.85. The signals with the effective g values at g=2.27 and 4.85 have been attributed to the isolated Cr3+ ions. The signal at g=1.96 has been attributed to the exchange coupled Cr3+ ions. The excitation spectrum exhibits bands characteristic of Cr3+ ions in distorted octahedral symmetry. The ligand field parameter Dq and the Racah interelectronic repulsion parameters B and C have been evaluated from the excitation spectrum. The emission spectrum exhibits an intense band centered at 700 nm (14,286 cm−1) and this band has been attributed to 2Eg→4A2g transition.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 40, Issue 7, Part A, August 2014, Pages 9629-9636
نویسندگان
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