Dielectric and magnetic response of BiFeO3 in the presence of ionic filler at room temperature

• Published in: Journal of materials science. Materials in electronics Vol. 35; no. 1; p. 71
• Main Authors: Sharma, Rikky, Maji, Partha Sona, Mukherjee, Rupam
• Format: Journal Article
• Language: English
• Published: New York Springer US 2024; Springer Nature B.V
• Subjects: Bismuth; Bismuth ferrite; Characterization and Evaluation of Materials; Chemistry and Materials Science; Coercivity; Dielectric loss; Dielectric properties; Dielectrics; Electrical impedance; Electrical resistivity; Energy storage; Fillers; Grain size; Materials Science; Morphology; Multiferroic materials; Nanoparticles; Nitrates; Optical and Electronic Materials; Physics; Room temperature; Sodium chloride; Temperature
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-023-11773-0

Composite systems consisting of ionic sodium chloride (NaCl) as a filler with varying weight percentages ( x  = 0%, 10%, 30%, and 50%) embedded into the matrix of multiferroic bismuth ferrite (BiFeO 3 ) were synthesized. Post-annealed at 750 °C, the XRD analysis reveals that the presence of NaCl leads to the formation of secondary phases. The particle grain size varies in the range of 0.5–1.5 μm as found from FESEM. The VSM study shows the coercive field (Hc) enhancement with maximum H c  = 79.18 Oe is found for the composite system x  = 10%. The electrical impedance study reveals that at a low-frequency regime, the real component of dielectric permittivity has relatively increased for the composite systems compared to as-prepared bismuth ferrite (BFO). The dielectric loss increases at low frequency but remains comparable at the high-frequency limit, indicating a possible role in the energy storage application. Exponent ( n ) for frequency-dependent electrical conductivity is found to be large ( n  > 1) which is due to various degrees of the proximity of adjacent NaCl grains distributed in a multiferroic matrix.