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• W2083463295 abstract "Room temperature magnetoelectric (ME) measurements are carried out on phase pure BiFeO3 and BiFe0.98Co0.02O3, prepared via sol–gel technique. At zero magnetic field, the longitudinal ME coupling coefficient (α) for BiFeO3 is found to be α = 20.935, which decreases on application of magnetic field and displays hysteresis in magnetic field (H) for the increasing and decreasing cycle of H. This hysteresis disappears for BiFe0.98Co0.02O3 and α becomes linear in H along with 17% drop in the magnitude compared to parent BiFeO3. In spite of 17% drop, magnitude of α = 17.375 is good enough for device applications especially where α must follow the applied magnetic field linearly, e.g., transistors, transducers, etc. Neutron diffraction studies show lattice stiffening due to cobalt substitution in BiFeO3 and likely to be the cause of disappearance of hysteresis in α. Calculated value of polarization P (using the parameters derived from neutron diffraction) shows 19% drop in magnitude of P for cobalt substituted sample. Surprisingly, dielectric measurements also showed 18% decrease in dielectric constant ɛ′ due to cobalt doping. Such a one to one correspondence in the three parameters viz., α, P and ɛ′, reflects a strong interdependence so that variation in any one of them is reciprocated in the other. Room temperature magnetodielectricity of 5% and 3.2% is observed for BiFeO3 and BiFe0.98Co0.02O3 respectively. Interestingly similar to α, ɛ′ also shows hysteresis in magnetic field for BiFeO3 and the hysteresis disappears for BiFe0.08Co0.02O3. The dc electrical resistivity measurements, suggests variable range hopping (VRH) with average hopping range 50.038/T0.25 and 40.058/T0.25 in BiFeO3 and BiFe0.98Co0.02O3 respectively, as the conduction mechanism." @default.
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• W2083463295 date "2015-04-01" @default.
• W2083463295 modified "2023-09-27" @default.
• W2083463295 title "Magnetoelectricity in BiFeO3 and BiFe0.98Co0.02O3 nano particles" @default.
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• W2083463295 doi "https://doi.org/10.1016/j.jallcom.2014.12.052" @default.
• W2083463295 hasPublicationYear "2015" @default.
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