Article ID Journal Published Year Pages File Type
1617555 Journal of Alloys and Compounds 2011 5 Pages PDF
Abstract

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.

Related Topics
Physical Sciences and Engineering Materials Science Metals and Alloys
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