Conductivity and electric properties of La_(1-x)Sr_xMnO_(3-δ)nanopowders

摘要

La0.8Sr0.2MnO3–δ was synthesized by the Pechini’s method. The XRD pattern and TEM indicate the formation of the perovskite without the presence of secondary phases. It was found that La0.8Sr0.2MnO3–δ sample prepared at 1000 °C in air atmospheres, contains about 13.11% of the manganese as Mn4+ and 86.89% of the manganese as Mn3+. The electric measurements were carried out for La0.8Sr0.2MnO3–δ nanoceramics by using impedance spectroscopy methods and found to be 0.1 S/cm at 250 °C similar to the typical value of La0.8Sr0.2MnO3-δ materials. Its dependence on reciprocal temperature shows quite complicated mechanism of conduction.