کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10714319 | 1025585 | 2011 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Raman characterization of Pb2Na1âxLaxNb5âxFexO15 and Pb0.5(5âx)LaxNb5âxFexO15 (0â¤xâ¤1) solid solutions
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
The ferroelectric compounds Pb2Na1âxLaxNb5âxFexO15 and Pb0.5(5âx)LaxNb5âxFexO15 (0â¤xâ¤1) with the tungsten bronze type structure have been investigated using Raman spectroscopy. The evolution of the spectra as a function of composition at room temperature is reported. In the frequency range 200-1000 cmâ1 three main A1 phonons around 240 (Ï
1), 630 (Ï
2) and 816 (Ï
3) cmâ1 were observed. The broadening of the Raman lines for high values of x originates from a significant structural disorder. This is in good agreement with the relaxor character of these compositions. The lowest-frequency part of the spectra, below 180Â cmâ1, reveals a structural change in the studied solid solutions. The behaviour of the Raman shift of the Ï
1 mode confirms that in Pb2Na1âxLaxNb5âxFexO15, a clear anomaly occurs in the vicinity of x=0.4.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 406, Issue 22, 15 November 2011, Pages 4257-4260
Journal: Physica B: Condensed Matter - Volume 406, Issue 22, 15 November 2011, Pages 4257-4260
نویسندگان
M. Bouziane, M. Taibi, L. Saviot, A. Boukhari,