Synthesis and Characterization of Fast Fired Multiferroic Magnetoelectric Bi1-xMnxFeO3

Reference	Presenter	Authors (Institution)	Abstract
08-020	Gustavo Sanguino Dias	Dias, G.S.(Maringa State University); Volnistem, E.A.(Maringa State University); Guimarães, P.V.(Maringa State University); Cótica, L.F.(Maringa State University); Santos, I.A.(Maringa State University);	Multiferroic magnetoelectric materials have attracted much attention because they can exhibit simultaneous effects of ferroelectricity and ferromagnetism in the same phase, and a linear coupling behavior between magnetization and polarization. This coupling between ferroelectric and ferromagnetic orders allowing the possibility of a new degree of freedom what enable the development of multiple-state memories, making possible storage data in both electric or magnetic orders. Furthermore, they have potential application as electric-field-controlled magnetic devices, and transducers with magnetically modulated piezoelectricity. Among the magnetoelectric materials the Bismuth ferrite, $BiFe{O}_3$ (BFO), has been wakened great attention because of its magnetoelectric behavior at room temperature. BFO has a rhomboedrally distorted perovskite structure (${\mathrm{ABO}}_3$) and $R3c$ space group exhibiting ferroelectric and antiferromagnetic ordering at room temperature with high Currie ($T_C ~ 1103 K$) and Neel ($T_N ~ 643 K$) temperatures. Even after many years of synthesis research, the preparation of highly resistive BFO ceramics remains a challenge. The main problems are related to the presence of impurities. Ceramics prepared through the conventional solid-state reaction tend to have undesired phases and exhibit high leakage currents that prevent technological application and hinder the study of its properties. In this sense, we propose the use of high-energy ball milling to obtain highly homogeneous ${\mathrm{Bi}}_{1-\mathrm{x}}{\mathrm{Mn}}_{\mathrm{x}}{\mathrm{FeO}}_3$ (x=0, 0.025, 0.05) powders, allied to the fast firing method followed by quenching to room temperature to prevent the segregation and formation of secondary phases and subsequently submitted to oxygen annealing to optimize the oxygen content. As a result, highly resistive monolithic ${\mathrm{Bi}}_{1-\mathrm{x}}{\mathrm{Mn}}_{\mathrm{x}}{\mathrm{FeO}}_3$ samples were achieved, and strong evidences of magnetoelectric coupling could be observed.
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