We have synthesized yttrium-doped bismuth ferrite nanoparticles through a modified Pechini technique. X-ray diffractometer, transmission electron microscope (TEM) and ultraviolet-visible spectrophotometer (UVVis) probes have been utilized to characterize the nanoparticles. Average particle size estimated from TEM found to be 29 nm for Bi 0.99 Y 0.01 FeO 3 samples. The band gap of the prepared BFO and BYFO nanoparticles varies from 1.97 to 2.29 eV, that is, within the visible range of the sunlight. This property of these nanoparticles can be utilized in photo catalytic decomposition of organic contaminants, such as Rhodamine-B (RhB) under visible light irradiation. We have explored and observed that RhB degrade up to 8 % while mixed with Bi 0.90 Y 0.1 FeO 3 for 1 h under 40 W lamp due to photo catalysis together with sensitization.
Unusual magnetic properties of nanocrystalline orthoferrite, GdFeO3 , synthesize by conventional solid state reaction (SSR) route based on stoichiometric mixing of Fe2O3 and Gd2O3 is reported here. The structural characterization of these nanoparticles was carried out by using X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM) techniques. We observe that the GdFeO3 phase start to precipitate at 1173 K which is rather lower for a SSR route. XRD and HRTEM studies confirm the growth of highly crystalline single phase GdFeO3 nanoparticles. Magnetic behavior shows the coexistence of weak ferromagnetism along with antiferromagnetic interaction. The field dependence magnetization delineates hysteresis loop at room temperature which is better at lower temperature.
Ni and Co doped nanocrystalline BiFeO 3 (BFO) have been prepared using a facile sol-gel technique. The effects of codoping on the crystal structure, morphology and electrical properties are investigated. X-ray diffraction and high-resolution transmission electron microscopy studies confirm the phase purity and growth of BFO nanoparticles. The heat-flow measurement using a differential thermal analyser shows an endothermic peak between 1070 and 1100 K representing ferroelectric to paraelectric phase transition. A systematic electrical conductivity study of these nanoparticles delineates that resistivity increases for doped BFO samples which is very much desirable for device applications of multiferroics.
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