Structural, microstructural and magneto-electric properties of single-phase BiFeO3 nanoceramics prepared by auto-combustion method
Abstract
Polycrystalline nano BiFeO3 powders were synthesized by auto-combustion method using urea as fuel and metal nitrates (Fe(NO3)(3).9H(2)O, Bi(NO3)(3)-5H(2)O) as oxidizers. In order to optimize the single-phase synthesis condition of BiFeO3, different fuel to oxidizer ratios have been investigated. The preliminary structural investigation using X-ray diffraction shows the samples were of single phase and crystallize in rhombohedral structure (R3c). The ferroelectric and antiferromagnetic ordering temperatures of BiFeO3 were found to be 832 degrees C and 364 degrees C respectively, from differential thermal analysis. The temperature dependent dielectric study shows an anomaly around 215 degrees C which corresponds to magneto-electric coupling in the material. Field-emission scanning electron micrographs show effect of fuel to oxidizer ratio on grain size evolution. The ferroelectric hysteresis loops for all the samples were measured at a frequency of 100 Hz confirming the ferroelectric nature. An evidence of magneto-electric coupling was also observed at room temperature from magneto-capacitance measurements. (C) 2013 Elsevier B.V. All rights reserved.
Keywords
Ceramics; Chemical synthesis; Dielectric properties; Crystal structure; Powder diffraction; RAY-POWDER DIFFRACTION; MULTIFERROIC BIFEO3; ROOM-TEMPERATURE; ELECTRIC-FIELD; DOPED BIFEO3; THIN-FILMS; CERAMICS; FERROMAGNETISM; TRANSFORMATION; NANOPARTICLES
DOI
10.1016/j.matchemphys.2013.05.040
Date of this Version
8-15-2013
Recommended Citation
Tripathy, Satya Narayan; Mishra, B. G.; Shirolkar, Mandar M.; Sen, S.; Das, Suprem R.; Janes, David B.; and Pradhan, Dillip K., "Structural, microstructural and magneto-electric properties of single-phase BiFeO3 nanoceramics prepared by auto-combustion method" (2013). Birck and NCN Publications. Paper 1453.
http://dx.doi.org/10.1016/j.matchemphys.2013.05.040