Exploration of magnetically stable BiFeO3CoFe2O4 composites with significant dielectric ordering at room temperature

• Published in: Journal of alloys and compounds Vol. 755; pp. 168 - 176
• Main Authors: Gaikwad, Vishwajit M., Acharya, Smita A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 30.07.2018
• Subjects: BFO-CFO; Magnetic stability; Perovskite-spinel; Magnetic stability; Perovskite-spinel; BFO-CFO
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2018.04.273

Present work demonstrates our attempts of enhancement of room temperature magnetic stability and dielectric ordering of BiFeO3 via perovskite-spinel composite approach. We selected CoFe2O4 spinel phase for the study. (1-x)BiFeO3(BFO)-xCoFe2O4(CFO) composites with compositions (x = 0, 20, 30, 40 wt%) were developed. Structure of the composite are ensured by Rietveld refinement of XRD patterns; which reveal rhombohedral (space group:R3c) symmetry for BFO and inverse spinel cubic (space group: Fd3¯m) symmetry for CFO. Microstructural backscattered electron image of sintered composites shows well distribution of CFO in BFO matrix with interaction of BFO and CFO phase at the interface. Remanent magnetization observed for composites is found to be 3 times higher than estimated value by using Vegard's law. Higher magnetic stability achieved in composites. Room temperature dielectric properties of BFO-CFO composites revealed higher dielectric constant with low loss. The enhancement in magnetic stability and dielectric ordering of composites might be useful in miniaturizing antenna system and electromagnetic shielding materials. [Display omitted] •(1-x)BiFeO3-xCoFe2O4 (x = 0–0.4) have been designed via mechanical processing route.•Composite formations led to structural modifications at surface/interfaces.•Significant enhancement in magnetic ordering and stability were observed.•Dielectric constant of composites were found of the order of 103.•BFO-CFO composites achieved higher functionality towards R.T. multiferroicity.