Abstract
The present paper explores of the lanthanum and calcium insertion effect on the physico-chemical properties of the Bi-0.8(La0.8Ca0.2)(0.2)FeO3 (LCBFO-8) Sol-Gel made multiferroic compound. The LCBFO-8 compound crystallized in a rhombohedral distorted structure with the R3c space group. The Morphological investigation confirmed the nanosize criteria of the examined nanoparticles with an average particle size less than 50 nm. Notably, the studied compound shows a colossal dielectric constant, low loss tangent tg(delta) values, an enhanced magnetization, and a reduction of the Curie transition temperature to 395 K, which confirms well the high utility of such compound for energy storage applications. At low and high temperatures, two dielectric relaxations have been detected in the frequency dependence curves of the dielectric constant and the Modulus imaginary part plots at low and high-temperature ranges. The symmetric and asymmetric dielectric parameters alpha and beta have been collected from the adjustment of the M '' based on the Havriliak-Negami (H-N) formalism. According to their values, it can be concluded that the high-temperature relaxation is a Cole-Cole-type dielectric relaxation, while the Cole-Davidson model fits the high temperature well.