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Structural, dielectric relaxation and magnetic features of the (La0.Ca0.2)0.9Bi0.1Fe1-yTiyO3 (y = 0.0 and 0.1) nanoparticles

Authors: A. Benali, M. Bejar, E. Dhahri, M.P.F. Graça, M.A. Valente, E.K. Hlil, B.F.O. Costa

Ref.: J. Alloys Compd. 876, 160222 (2021)

Abstract: Two nanoparticle orthoferrite materials (La0.8Ca0.2)0.9Bi0.1Fe1−yTiyO3 (y = 0.0 and 0.1) have been successfully synthesized via the assisted ball milling solid-state reaction. The effect of Bismuth and Titanium ions insertion in A and B-sites of La0.8Ca0.2FeO3 material on structural, dielectric relaxation and magnetic properties was conducted. Structural study reveals the formation of majoritarian orthorhombic phase in both nanomaterials. Importantly, both compounds present a giant dielectric constant ε’ and low dielectric loss tangent tg(δ). Two relaxation processes have been detected at low and high-temperature ranges. The adjustment of the imaginary parts of complex Modulus via the Havriliak-Negami formalism (H-N) confirms a Cole-Cole (grains) and Cole-Davison (grain boundaries) relaxation processes at low and high temperature regions, respectively. The magnetic study reveals the enhancement of magnetization when introducing Titanium ions in B-site which increases the Ferromagnetic interactions. It also confirms an important decrease in the Curie Weis temperature (TC = 450 K).

DOI: 10.1016/j.jallcom.2021.160222