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We report the high temperature impedance and dielectric measurement of thenanocomposites comprising of CoFe2O4 (CFO) and LaNiO3 (LNO) by changing thecontent of LaNiO3 (0, 5, 10 and 15 %). The aim of the present study is torelate the structural defects expected at the interfaces of the composites withthe result of impedance and dielectrics. The result separately shows the grain,grain boundary and electrode relaxation behaviour in the impedance and modulusspectroscopy. As calculated using Arrhenius law it indicates a reducedactivation energy of the grain boundary in the presence of LNO compared to pureCFO. This assists the charge carriers for short range hopping across theboundary as reflected from ac conductivity. The dielectric constant at highfrequency side manifests the interband transition in both pure CFO and thecomposite materials. The frequency of the transition can be tuned by LNOcontent. Thus this detail study will help to understand the relaxationphenomenon and dielectric behaviour in the presence of structural defects anddisorder.

Effect of LaNiO3 on the impedance and dielectric properties of CoFe2O4: a high temperature study