Temperature and Grain Size Effect on the Electrical Conductivity of 0.67 0.33 3 La Ca MnO

Abstract

Abstract— A study for different samples of the compound of the single Perovskite 0.67 0.33 3 La Ca MnO has been performed as a function of grain size and investigated by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Electrical Resistivity Measurement Setup (ERMS). It is found that the crystal structure remains the same for all the samples, while the grain size decreases with the increases of the grinding time and it increases with sintering temperature. At the low temperature measurement of resistivity, it is found that the values of the metal–insulator transition temperature TMI depends upon the grain size effect, whereas it decreases with the increases of the grain size. The scattering process appears to be dominated by electron–electron interaction process.