کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9784033 | 1512028 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Raman scattering study on ferroelectric (Ba0.32Sr0.68)2Nb2O7 ceramics
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Raman scattering technique was applied to examine the Ba-doping effect to the two low temperature phase transitions of Sr2Nb2O7 (SN) in the temperature range from â190 to 600 °C. The line shape of Raman spectra can be well fitted by multidamped harmonic oscillator model. We did not observe any soft mode related to the two low temperature phase transitions corresponding to those of the pure SN. It is correlated to the disappearance of the incommensurate phase in (Ba0.32Sr0.68)2Nb2O7 ceramics. However, the temperature dependence behavior of the three low frequency modes indicates another new structural phase transition around 270 °C. It is considered that the reduction of the interlayer interaction caused by partial replacement of Sr-site by Ba-site, whose ionic radius is larger than that of Sr, may be the reason for the disappearance of the incommensurate phase transition in (Ba0.32Sr0.68)2Nb2O7 ceramics.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: B - Volume 120, Issues 1â3, 15 July 2005, Pages 45-49
Journal: Materials Science and Engineering: B - Volume 120, Issues 1â3, 15 July 2005, Pages 45-49
نویسندگان
Anwar Hushur, Yukikuni Akishige, Seiji Kojima,