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- W2423733492 abstract "Structural and electrical properties of La0.67Ca0.33Mn1-xCrxO3 (x = 0 and 0.2) manganites are studied in this work. The samples were prepared using Pechini sol-gel method at 1173 K. Rietveld analysis of X-ray diffraction (XRD) patterns shows the formation of pure crystalline phase with orthorhombic Pnma structure with a decrease of the unit cell volume and crystalline domain size when increasing Cr-content. Electrical properties of the samples have been investigated using complex impedance analysis in 180–320 K temperature range with varying frequency between 40 and 106 Hz. For both samples, frequency dependence of imaginary part of impedance (Z″) shows the existence of relaxation phenomenon. The impedance study using Nyquist representation revealed the appearance of semicircle arcs and an equivalent circuit of the type of R1 + (R2//ZCPE) has been proposed to explain the impedance results. The conductance curves were analyzed by Jonscher power law and the deduced activation energy values are close to those calculated from relaxation time indicating that relaxation process and conductivity have the same origin." @default.
- W2423733492 created "2016-06-24" @default.
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- W2423733492 date "2016-12-01" @default.
- W2423733492 modified "2023-09-23" @default.
- W2423733492 title "Effect of 20% Cr-doping on structural and electrical properties of La0.67Ca0.33MnO3 perovskite" @default.
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- W2423733492 doi "https://doi.org/10.1016/j.jallcom.2016.06.140" @default.
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