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
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Charge ordering analysis by electrical and dielectric measurements in Ca2−xPrxMnO4 (x = 0–0.2) compounds
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
نویسندگان
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