Open AccessGiant Dielectric Response of Corundum Structure Fe0.7Cr1.3O3 Nanocrystallite
Author(s) -
Naresh Babu Gatchakayala,
Rama Sekhara Reddy Dachuru
Publication year - 2022
Publication title -
ecs journal of solid state science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.488
H-Index - 51
eISSN - 2162-8777
pISSN - 2162-8769
DOI - 10.1149/2162-8777/ac6a79
Subject(s) - materials science , dielectric , corundum , relaxation (psychology) , grain boundary , nanoparticle , impurity , activation energy , permittivity , precipitation , condensed matter physics , analytical chemistry (journal) , composite material , nanotechnology , microstructure , optoelectronics , chemistry , psychology , social psychology , physics , organic chemistry , chromatography , meteorology
We report the structure and dielectric properties of Fe0.7Cr1.3O3 nanocrystallites synthesized by co-precipitation method. X-ray diffraction shows that the nanoparticles possess a typical corundum structure and no other impurity phases are observed. These nanoparticles exhibit a high dielectric permittivity (' ~ 103) at room temperature below 1 kHz. The dielectric relaxation follows the thermally activated process with activation energy of 0.226 eV. Both components of grain relaxation and grain boundary relaxation times were extracted from modulus spectra. The internal barrier layer capacitance (IBLC) effect is responsible for observed high dielectric response in these nanoparticles.