Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1617555 | Journal of Alloys and Compounds | 2011 | 5 Pages |
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
Authors
M.T. Tlili, N. Chihaoui, M. Bejar, E. Dhahri, M.A. Valente, E.K. Hlil,