Relaxor ferroelectric like high dielectric constant in SmCrO 3 semiconductor ceramics
Journal
International Conference on Nanoscience, Engineering and Technology 2011
Pages
304-307
Date Issued
2011
Author(s)
Abstract
The dielectric properties and impedance spectroscopy (IS) of perovskite SmCrO3 ceramics were studied in the frequency range of 100Hz 1MHz in the temperature range from 80 K to 300 K. These materials exhibited colossal dielectric constant value of ~ 104 at room temperature. The response is similar to that observed for relaxor-ferroelectrics. IS data analysis indicates the ceramics to be electrically heterogeneous semiconductors consisting of semiconducting grains with dielectric constant 10 and more resistive grain boundaries. We conclude, therefore that grain boundary effect is the primary source for the high effective dielectric constant in SmCrO 3 ceramics.
Type
conference paper