Synthesis and AC Electrical Characterization of Co Doped Bismuth Manganite Nanoparticles

Abstract:

Multiferroic bismuth manganites (BiMnO₃) possess both ferromagnetic and ferroelectric properties. Their electrical properties can be controlled by doping for useful applications. In this work single-phase cobalt doped bismuth manganite nanoparticles having general formula BiMn_1-xCo_xO₃ (x=0, 0.2, 0.4, 0.6) were synthesized by co-precipitation method. Structural properties like lattice parameters and crystallite size of samples were determined by the data obtained by X-rays diffraction. The dielectric constant (ε) and dielectric loss tangent (tanδ) of samples were investigated as a function of frequency from 20Hz-3MHz using ac measurement data. For all the compositions dielectric constant was decreased with increasing frequency, however it increased with the increase in cobalt content. However cobalt addition causes a decrease in loss tangent as compared to pure BiMnO₃ composition. The origin of this behavior is discussed in terms of Maxwell-Wagner and Koops model. Substitution of Mn with Co, in BiMnO₃-based compounds is supposed to cause better properties in terms of tangent loss.

• Periodical: Key Engineering Materials (Volumes 510-511)
• Pages: 527-531
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.510-511.527
• Online since: May 2012
• Authors: Khush Bakhat Akram, M.S. Dar, Faheem-ul-Hassan Faheem-ul-Hassan, Muhammad Anis-ur-Rehman
• Keywords: Co-Precipitation Method, Dielectric Response, Manganite, Multiferroic

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