Effect of Ag addition on electricial transport and magnetic properties of La0.67Ca0.33MnO3 compound

(La0.67Ca0.33MnO3)1-x : Agx (x = 0.1, 0.2, 0.3 ve 0.4) composites are synthesized by a solid-state reaction route. X-ray analyses showed that all the samples are crystallized in single perovskite phase. The scanning electron micrograps (SEM) showed beter grains morphology in terms of size and diffusion of grain boundaries with an increase in Ag content. The magnetisation and resistance measurements showed that the Curie temperature (Tc) and the metal-insulator transition temperature remains nearly the same as that of the pure La0.67Ca0.33MnO3 sample with increasing Ag content. A small increase was observed in MR value with increasing Ag content. The decrease in resistance and small increase in MR was interpretedas the basis of improved grain size and connectivity with Ag addition in the matrix.