Content area
Full Text
http://crossmark.crossref.org/dialog/?doi=10.1007/s11051-015-3233-9&domain=pdf
Web End = http://crossmark.crossref.org/dialog/?doi=10.1007/s11051-015-3233-9&domain=pdf
Web End = http://crossmark.crossref.org/dialog/?doi=10.1007/s11051-015-3233-9&domain=pdf
Web End = http://crossmark.crossref.org/dialog/?doi=10.1007/s11051-015-3233-9&domain=pdf
Web End = http://crossmark.crossref.org/dialog/?doi=10.1007/s11051-015-3233-9&domain=pdf
Web End = J Nanopart Res (2015) 17:429 DOI 10.1007/s11051-015-3233-9
http://crossmark.crossref.org/dialog/?doi=10.1007/s11051-015-3233-9&domain=pdf
Web End = http://crossmark.crossref.org/dialog/?doi=10.1007/s11051-015-3233-9&domain=pdf
Web End = http://crossmark.crossref.org/dialog/?doi=10.1007/s11051-015-3233-9&domain=pdf
Web End = RESEARCH PAPER
http://crossmark.crossref.org/dialog/?doi=10.1007/s11051-015-3233-9&domain=pdf
Web End = http://crossmark.crossref.org/dialog/?doi=10.1007/s11051-015-3233-9&domain=pdf
Web End = Inuence of cobalt doping on structural and magnetic properties of BiFeO3 nanoparticles
U. Khan . N. Adeela . K. Javed . S. Riaz . H. Ali .M. Iqbal . X. F. Han . S. Naseem
Received: 1 May 2015 / Accepted: 22 October 2015 / Published online: 3 November 2015 Springer Science+Business Media Dordrecht 2015
Abstract Nanocrystalline cobalt-doped bismuth ferrites with general formula of BiFe1-dCodO3 (0 B d B 0.1) have been synthesized using solution evaporation method. Structure and phase identication was performed with X-ray diffraction (XRD) technique. The results conrm the formation of rhombohedral-distorted Perovskite structure with R3c symmetry. A decrease in lattice parameters and an increase in X-ray density have been observed with increasing cobalt concentration in BiFeO3. Particle size determined by transmission electron microscope was in good agreement with XRD, i.e., 39 nm. Room-temperature coercivity and saturation magnetization of nanoparticles were increased up to 7.5 % of cobalt doping. Low-temperature magnetic measurements of
selected sample showed increasing behavior in saturation magnetization, coercivity, effective magnetic moments, and anisotropy constant. An increase in coercivity with decrease in temperature followed theoretical model of Knellers law, while modied Blochs model was employed for saturation magnetization in temperature range of 5300 K.
Keywords Ferrite nanoparticles Perovskite
structure Knellers law Modied Blochs law
Introduction
Multiferroic materials exhibit both ferroelectric (FE) and ferromagnetic (FM) properties in a single phase known as magnetoelectric (ME) compounds. In ME compounds, induced magnetization as a result of applied electric eld produces self-polarization (Eerenstein et al. 2006; Mazumdar et al. 2010; Park et al. 2007). The enriched physical properties of FE and FM coupling in ME compounds make them important candidate for industrial as well as research point of view. Unfortunately, in nature, there are few multiferroic materials which exhibit ME properties at room temperature because FE and FM ordering in transition metals needs d0 and partially lled d electronic conguration, respectively, which is very rare in single-phase multiferroics. Bismuth ferrite with chemical formula BiFeO3...