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The transport properties of Ga-doped La0.7(Ba, Sr)0.3Mn1−xGaxO3 (x=0.0, 0.1 and 0.2) perovskite materials were investigated by admittance spectroscopy over a wide range of temperatures and frequencies. The electronic conduction was found to be dominated by thermally activated hopping and to depend strongly on Ga-content. Results have shown samples with x=0.0 and 0.1 exhibit a metallic behavior at...
Perovskite oxides La0.8R0.2Fe0.5Cr0.5O3 (R=La, Nd, Gd and Dy) have been synthesized by solid state reaction method. The Rietveld analysis of the XRD data showed that the samples crystallize with orthorhombic structure in the space group Pbnm. The results of resistivity measurements revealed that all the samples show insulating behaviour throughout the temperature range studied. The electrical conduction...
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