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Single phase BiFeO3 nanoparticles have been successfully synthesized for thefirst time by a novel citrate combustion method without using any solvent. Wellmixed metal nitrates along with citric acid which is used as fuel combust togive BiFeO3 nanoparticles after annealing. These particles are single phase innature and crystallize in the rhombohedral distorted perovskite structure(space group-R3c) which has been confirmed by the Rietveld refinement of theroom temperature powder x-ray diffraction data. Nearly spherical particles ofaverage particle size 47 nm have been seen from transmission electronmicrograph. Room temperature magnetic hysteresis measurement shows weakferromagnetism though the magnetization does not saturate upto 1.75 T appliedfield. The coercive field value is calculated to be 180 Oe which is 3 timeshigher than that prepared by solvent free combustion method using Glycine. 57FeM\"ossbauer spectrum can be fitted with a sextet corresponding to singlemagnetic state of hyperfine field about 49.5 T corresponding to Fe3+ state ofthe iron atom. The dielectric relaxation and ac conductivity as a function offrequency have been discussed. High dielectric permittivity has not been foundin these nanoparticles like other reported BiFeO3 ceramics.

Magnetic and Dielectric Properties of Multiferroic BiFeO3 Nanoparticles Synthesized by a Novel Citrate Combustion Method