کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1619313 | 1005719 | 2010 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Structural and electrical properties of Ba5âxCaxSmTi3Nb7O30 (x = 0-5) ferroelectric ceramics
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
Samples of the compositions Ba5âxCaxSmTi3Nb7O30 (x = 0-5), where Ba has been replaced by Ca in steps, were synthesized by solid state reaction method and studied for their structural, dielectric and electrical properties. X-ray diffraction analysis shows the formation of the compounds in an orthorhombic structure at room temperature. Scanning electron micrographs reveal that the average grain size of the compounds increases with increase in calcium content. Detailed studies of dielectric properties as a function of temperature at different frequencies suggest that the synthesized compounds undergo non-relaxor type ferroelectric-paraelectric phase transition of diffuse nature with a decrease in the value of dielectric constant as calcium content increases. When barium is completely replaced by calcium (i.e., Ca5SmTi3Nb7O30), the compound does not show any phase transition. The ferroelectric nature of the studied compounds was confirmed by recording the polarization-electric field (P-E) hysteresis loops at room temperature. The remanent polarization value is observed to be highest in the sample with x = 1. The temperature variation of P-E loop in the Ca free compound has been reported. The dc and ac conductivity study over a wide temperature range suggests that the compounds have negative temperature coefficient of resistance (NTCR) behaviour.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 495, Issue 1, 9 April 2010, Pages 7-12
Journal: Journal of Alloys and Compounds - Volume 495, Issue 1, 9 April 2010, Pages 7-12
نویسندگان
Prasun Ganguly, A.K. Jha,