Study of Enhanced Magnetodielectricity in Gd3+ Substituted Bi2Fe4O9
New Trends in Physical Science Research Vol. 2,
22 April 2022
,
Page 71-78
https://doi.org/10.9734/bpi/ntpsr/v2/1955B
Abstract
We report the investigation of structural, magnetic, dielectric and magnetodielectric properties of orthorhombic Bi2(1-x)Gd2xFe4O9 (x = 0, 0.015) ceramics synthesized by the solid state reaction route. Room temperature Rietveld refinement of X-ray diffraction pattern of the ceramics shows structural distortion due to lower ionic radii Gd3+ (1.05 Å) substitution at Bi3+ (1.17 Å) site. Magnetic measurements confirmed an enhanced antiferromagnetic transition temperature (TN) in x = 0.015 (254 K) as compared to the BFO (250 K) along with an increase in magnetization due to the coupling between Gd3+ and Fe3+ ions. A concomitant anomaly in dielectric and tan loss plot around magnetic transition temperature indicated plausible magnetoelectric coupling (MEC) in both the samples and the MEC coefficient (Y) is approximated by ~ YM2. Enhanced magnetodielectric response (~100 %) has been observed for x = 0.015.
- Rietveld refinement
- dielectric constant
- magnetization
- antiferromagnetic transition
- magnetoelectric coupling