Abstract
The La0.7Ca0.3MnO3 nanograins are synthesized by sol-gel method. The phase crystalinity is confirmed by XRD profile analysis. TEM micrograph divulged polyhedral grains with an average size of 41 nm. Impedance, conductivity and dielectric properties are studied in the frequency scope of 102–106 Hz from room-temperature to 200 °C. The Cole-Cole plots of impedance exposed grain boundary dominance and it is further confirmed by Cole-Cole plots of modulus. In different frequency regime, the conductivity curves seem to obey different conduction mechanism up to 100 °C and after this temperature, only one type of conduction is observed. The dielectric constant and loss are enhanced slowly with the rise in temperature up to 100 °C and thereafter a gradual increase was noticed. The La0.7Ca0.3MnO3 nanoparticles having a low value of dielectric loss below 100 °C can be a possible candidate for nanocapacitor applications.
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