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Influence of Ba and Mo co-doping on the structural, electrical, magnetic and optical properties of BiFeO 3 ceramics

In this work, Bi 0.8 Ba 0.2 Fe 1 − x Mo x O 3 (x = 0, 0.5, 0.10 and 0.15) ceramics were synthesized by conventional solid-state reaction to evaluate the influence of Ba 2+ and Mo 6+ co-doping on the structure, morphology, electrical, magnetic and optical properties of BiFeO 3 ceramic. Rietveld refin...

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Published in:Materials research express 2020-01, Vol.7 (1), p.16312
Main Authors: Sen, Aungkan, Hasan, Md Khalid, Islam, Zahidul, Hassan, Md. Rahat Al, Zaman, Tasmia, Matin, M A, Gulshan, Fahmida
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description In this work, Bi 0.8 Ba 0.2 Fe 1 − x Mo x O 3 (x = 0, 0.5, 0.10 and 0.15) ceramics were synthesized by conventional solid-state reaction to evaluate the influence of Ba 2+ and Mo 6+ co-doping on the structure, morphology, electrical, magnetic and optical properties of BiFeO 3 ceramic. Rietveld refinement of x-ray diffraction data was done to obtain the subtle structural information. A tetragonal structure of P4mm type was revealed for Bi 0.8 Ba 0.2 FeO 3 (x = 0) ceramic. Evolution of rhombohedral (R3c) phase was observed with Mo 6+ doping and a complete transformation to R3c phase from P4mm was found for 15 wt% Mo 6+ doping. This type of transformation causes distortion in the structure and results in changing bond angle. Magnetization was found to be improved with increasing the percentage of Mo 6+ up to 10 wt%. Canting of spin due to the change in Fe-O-Fe bond angle is believed to be the main reason behind this improvement. One secondary phase BaMoO 4 was found and becomes prominent with Mo 6+ doping. Possible formation of this impurity and its correlation with properties are explained. Microstructural analysis was done to observe the Ba 2+ and Mo 6+ co-doping effect on grain size and distribution. A correlation of grain size with electric and magnetic properties is drawn and elucidated. Dielectric constant shows an increasing trend with Mo 6+ doping. Reduction in oxygen vacancy, due to charge compensation upon high charged Mo 6+ addition, believed to be the staple reason behind the dielectric constant increment. Lastly, optical band gap energy found to be decreased with the addition of Mo 6+ and possible reasons behind this are evaluated. Overall, co-doping of Ba 2+ and Mo 6+ found to have a positive influence over materials electrical, optical as well as magnetic property.
doi_str_mv 10.1088/2053-1591/ab6801
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Magnetization was found to be improved with increasing the percentage of Mo 6+ up to 10 wt%. Canting of spin due to the change in Fe-O-Fe bond angle is believed to be the main reason behind this improvement. One secondary phase BaMoO 4 was found and becomes prominent with Mo 6+ doping. Possible formation of this impurity and its correlation with properties are explained. Microstructural analysis was done to observe the Ba 2+ and Mo 6+ co-doping effect on grain size and distribution. A correlation of grain size with electric and magnetic properties is drawn and elucidated. Dielectric constant shows an increasing trend with Mo 6+ doping. Reduction in oxygen vacancy, due to charge compensation upon high charged Mo 6+ addition, believed to be the staple reason behind the dielectric constant increment. Lastly, optical band gap energy found to be decreased with the addition of Mo 6+ and possible reasons behind this are evaluated. 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title Influence of Ba and Mo co-doping on the structural, electrical, magnetic and optical properties of BiFeO 3 ceramics
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