Synthesis and Characterization of Ba2+, La3+, Zr4+ Co-Modified Multiferroic BiFeO3

4th International Conference on Structure, Processing and Properties of Materials

Khan, F.^1 ; Mondal, S.^1 ; Usama, H.M.^1 ; Sharif, A.^1 ; Matin, M.A.^2

MME Department, Bangladesh University of Engineering and Technology, Dhaka

1000, Bangladesh^1

Department of Glass and Ceramics, Bangladesh University of Engineering and Technology, Dhaka

1000, Bangladesh^2

关键词: Electrical leakage;    Magnetic and electric properties;    Multiferroics;    Remnant polarizations;    SEM analysis;    Solid state sintering;    Synthesis and characterizations;    X-ray diffraction data;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/438/1/012031/pdf
DOI  :  10.1088/1757-899X/438/1/012031

来源: IOP

【 摘 要 】

The objective of this research project was to reduce the electrical leakage, enhance the magnetic and electric property as well as to stabilize the BiFO3 structure by co-doping La, Ba and Zr. At first the solid state sintering process was done to synthesize the Bi.8LaXBa0.2 - xFe.95 Zr.05O3 (where, x = 0.05, 0.10, 0.15, 0.20). X-ray diffraction data revealed a stabilized R3C structure with the dopants. The amount of zirconia in B-site resulted in the reduction of vacancy which ultimately reduced leakage current. For the higher percentage of Ba2+ the oxygen vacancy increased which led to higher leakage current. Thus for increasing the La3+ up to 15 mole % with decreasing Ba2+ dielectric constant increased For further addition of La3+ (i.e. 20%) the dielectric constant decreased again. From the SEM analysis the coherent grain size was confirmed for the temperature at 950°C. With the increase of La3+ and decrease of Ba2+ the grain size increased. For the composition with 5% of La3+, the p-loop was found to be satisfactory with the remnant polarization of 0.25 (μC/cm2) and the coercivity of 330V. However the p-e loop for the other compositions was found to be unsatisfactory.