کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1617555 | 1005689 | 2011 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Charge ordering analysis by electrical and dielectric measurements in Ca2−xPrxMnO4 (x = 0–0.2) compounds
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
Ca2−xPrxMnO4 (0 ≤ x ≤ 0.2) polycrystalline ceramic powders were synthesized by sol–gel method. The X-ray diffraction (XRD) profiles were indexed with a tetragonal and orthorhombic structure for Ca2MnO4 and Pr-doped compounds, respectively. Electrical properties were investigated by dc and ac electrical measurements. The dc measurements have revealed an insulating state for all compounds in 80–350 K temperature range. Both dc and ac measurements have highlighted a charge ordering (CO) transition at TCO = 233 and 245 K for x = 0.175 and 0.2, respectively. The CO state was found to be accompanied by a jump of the hopping activation energy and a rapid rise of both dielectric permittivity and imaginary part of ac electrical impedance.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 509, Issue 22, 2 June 2011, Pages 6447–6451
Journal: Journal of Alloys and Compounds - Volume 509, Issue 22, 2 June 2011, Pages 6447–6451
نویسندگان
M.T. Tlili, N. Chihaoui, M. Bejar, E. Dhahri, M.A. Valente, E.K. Hlil,